oompa loompa doompa de doo
use Grusilda, Monster Masher on a creature you own and a creature an opponent owns, then activate Homeward Path. Hell yeah, good luck resolving that.
(https://www.reddit.com/r/EDH/comments/7ibige/grusilda_ruling/)
Also, what about transform cards?
Good list of questions from https://tappedout.net/mtg-questions/7-grusilda-monster-masher-questions/
If I used Grusilda to combine a Graf Rats and a Midnight Scavengers, could they still meld into a Chittering Host?
If one half of a combination can transform and does so, what happens to the combination.
If both halves can transform and one does so, do both halves transform and it becomes a combination of their other sides?
If one half melds with another creature and does so, what happens with the combination?
If one half of a combination belongs to an opponent who leaves the game, what becomes of the remaining half?
If a combination is exiled and returned to the battlefield due to a card like Seal Away or Otherworldly Journey, what happens with the combination?
The wording of Grusilda implies that the combination has two separate names and mana costs. Is this correct?
Throw a Rules Lawyer in, too, for extra fuckage. Only really relevant, though, to combining a creature with augment with a non-host creature. Like two creatures with augment, for example. EDIT: Actually, according to this (https://magicjudge.tumblr.com/post/168401902018/if-i-use-grusilda-monster-masher-to-put-two), it doesn't break anything, and it's all good. Presumably, the same would happen with an augment creature on a non-host creature.
What would happen if you use Grusilda's ability to combine a Legendary Creature with some creature, and another copy of the same Legendary Creature with some other creature. Would the legend rule destroy one? Or would they both survive, since they're two different creatures with different names attached?
What if you control a Midnight Scavengers, and a combined creature with Graf Rats and something else, and enter your combat phase? What in the good God happens then?
What happens with creatures that have persist or undying, and are made of up creatures owned by you and an opponent? What happens in same scenario if the combined creature is flickered or blinked?
Update: With persist and undying on a combined creature made up of cards owned by you and your opponent, I'd say the way to handle it is the standard rules way, rather than MaRo's ridiculous ruling on Augmented creatures (he's ruled that augmented creatures can be flickered and still come back to the field augmented). Ownership would throw a wrench in that, so the standard way to handle it is the same as melded creatures: if the combined creature with persist or undying dies, both cards return to the field separated, each under their owner's control, with a +1/+1 or -1/-1 counter on them (as appropriate, regarding if they had undying, persist, or both). Same if the combined creature is blinked: both cards come back to the field separated, under your control, unless the effect specifies they must come back under their owner's control, in which case, each comes back under their owner's control. Although, with the flickering, that could be handled the same way as the augmented creatures, and come back combined, simply because ownership isn't an issue in that scenario. So, either way works. Same thing happens with cards like Supernatural Stamina and other similar cards. The combined creature dies, then both cards come back to the field separated, each under their owner's control. I'd also say that Seal Away, Otherworldly Journey, and Oblivion Ring are all handled the same way, as well. For Seal Away, they come back separated under your opponent's control, and with the latter two, they come back separated, each under their owner's control.
Update: The Legend rule is solved, I think. Since the effect of Grusilda says that the combined creature "has both names," we can therefore conclude that the two names of the combined creatures make up the name characteristic of the combined creature, and so, if the two combined creatures are made of the same two creatures, at least one of which is legendary, then the legend rule applies, and one must be sacrificed, but if the two combined creatures are made of the same legendary creature, and two other different creatures (so, for example, one combined creature is Sygg, River Cutthroat and Ahn-Crop Crasher, and the other is Sygg, River Cutthroat and Nef-Crop Entangler), then because their names are technically different, since both names make up the name of the combined creature, both can stay on the battlefield, and the legend rule does not apply, even though they get their legendary typing from the same creature card.
Update: Here's a compelling argument to resolve the issue of ownership of combined creatures when using Homeward Path: https://tappedout.net/mtg-questions/ownership-on-melded-cards/
Update: I've resolved a ton of shit from above, like from the list. And I'm going to discard MaRo's rulings on Augmented creatures and assume it doesn't apply to these scenarios, because otherwise it's completely borked. So, first things first, combining a creature you own with a creature you don't own and then activating Homeward Path, essentially, the active player decides who keeps it. It's a timestamp rule, when Homeward Path is activated, there are 2 triggers put on the stack for that combined creature because it has two owners, the active player determines the timestamp order on those two triggers, and the trigger with the most recent timestamp has priority. Timestamp rules also make a meld work, if a Graf Rats and Midnight Scavengers are combined, and then you enter your combat phase, they trigger, that ability has a more recent timestamp, they exile, and return to the battlefield melded. This won't happen if you don't own either of the meld cards, of course, because melding them would be an illegal move, so they would stay combined. If you have a meld card combined with another non-meld card, and a matching meld card also on the field (combined or alone), according to rules 701.36a, 701.36b, 701.36c, the rules on Melding, the combined creature and other solo or combined creature would be exiled, the meld creatures would return to the battlefield melded, and the remaining cards remain in exile.
This next solution is a bit convoluted, but I'm pretty sure it works. If you're in a game with more than 2 players, and you combine a creature you own with a creature owned by opponent 1, and opponent 1 leaves the game for whatever reason, I'm basing what happens next off of rules 800.4a, 108.4, 403.3, a ruling made on Yet Another Aether Vortex, and some additional rules and rulings. Basically, when opponent 1 leaves the game, all objects owned by them leave the game, this includes the card they own that makes up the combined creature, as well as the permanent that is the combined creature, but not the card that you own that made up the combined creature, that remains on the battlefield as itself. "Enter the battlefield" effects on that remaining creature do not trigger, because the card left behind is a permanent on the battlefield but never enters it, and according to rule 800.4a, I think "leave the battlefield" effects on the combined permanent do not get to resolve, because since opponent 1 would have partial ownership of those abilities on the stack, rule 800.4a says those abilities will cease to exist. However, I do believe other "leave the battlefield" effects on other permanents will trigger. I don't know, and it doesn't really matter, they'll be handled however they're normally handled in a multiplayer game, so it won't break the game state, which is my desired goal here. The remaining card is a permanent, because it's an object on the field, and an object on the field is a permanent.
Now, transforms. These are tricky, and I haven't solved all of them, yet. I have solved the ones that exile, though. If a Liliana, Heretical Healer
is combined with some other creature (and the ownership of these cards does not matter), and Liliana's transform ability is triggered, both cards (the one permanent) are exiled, they are separated in exile, and both return to the battlefield, Liliana transformed, each under their owner's control, whoever their owners may be. I do not know, however, what would happen if Liliana, Heretical Healer
and Chandra, Fire of Kaladesh
are combined, and only one of their transform abilities is triggered. I also do not know what will happen in the case of transform cards that do not exile when triggered, in the cases of two transform cards together with the same transform trigger, two transform cards together with different transform triggers and only one is triggered, and a transform card combined with a non-transform card with the transform triggered. I'm still trying to work these scenarios out.
I will admit, I was expecting transform cards to be a lot cleaner and easier to solve than the meld cards, but it seems the opposite has turned out to be true.