If Decay was worded as the suggestion entails it would say "Soulshift X." I worded it the way it is because it makes costing creatures and picking their power and toughness relevant. A CMC 1 0/4 wall is decent in draft, but when you have Decay in the format, it becomes possible to generate small advantage with each death assuming the creatures are designed properly.

In this way, Decay does not take over a standard metagame because chaining out of the higher CMCs becomes prohibitive as you head down due to things like Champion of Order being the norm (if not slightly better than the norm) in the C/U brackets.

Thanks for featuring my Stalk mechanic, though I think Wanderlust was more interesting!

As for the power level of the two-for-one-ness: That's easily adjustable via the cost of the ability. Perhaps the Bears' Stalk cost should be upped to 3GG or even 4GG.

PS: Mythics can certainly be support cards. Armada Wurm does a good job enabling Populate decks. It's just that there need to be plenty of non-Mythic support cards as well.

So, for Stalk we might have something like:

Ambush Tactics (U)

1GG

Enchantment

Whenever a creature enters the battlefield, if it's your Main Phase, target creature gets +1/+1 until end of turn. Otherwise, target creature gets +2/+2 until end of turn instead.

The Assassins were quiet--but on the Beasts' home turf, they were nervous too.

Is this the part where we all yell at Lotus Cobra ?

And holy bean dip I thought of a magnificent design for contraptions.

Oh yeah, good job with the mechanics, everyone! I couldn't muster the bravery to submit one...

Suggested wording for "Stalk:" (You may cast this creature for its Stalk cost by targeting an attacking or blocking creature. If you do, that creature fights this creature.)

@ MinscAndBoo

I think he was more getting at the idea that Mythics are not good examples of support cards. My mythic sets up Rebirth perfectly, board-wipe and make a bunch of tokens to sac to bring your rebirth creatures back? Sweet...it's the same as how Armada Wurm fits the populate mechanic perfectly, but doesn't benefit the game for limited.

You need uncommons and commons that make your mechanic useful...for example, Rebirth needs creatures on the board, and cards in the graveyard to work...so I need something like;

Auntie's Healing Table (3)

Artifact U

Sacrifice a creature: regenerate target creature.

Essentially, what you said.

did anyone care for my terraforming idea?

@killroy726It seemed a bit cumbersome. i don't think it is the sort of stuff i would expect a common or uncommon to do. But it does have synergy with the stuff Tekkactus and me thought about (well either that or it disrupts on more than one level). Somehow it feels more like a (probably blue) support card than a mechanic of a larger number of creatures.

The mechanic i liked best of all the submitted/featured ones is chaos. This one just seems like fun, but spikes would probably not be a fan of the random element.

Landflash is probably the most troubling one. Lands which are strictly better than basic lands should not be created cause everyone would run 4 of them. A "flash island" would require some sort of additional cost or drawback. Also i suspect there is some stuff in the zendikar block which acts funny with this in the mix. Btw the only way i can think of to play lands with instant speed requires at least two other cards or is there some green spell i am missing?

Could Landflash be balanced by forcing you to sacrifice/exile the land at the end of turn, essentially making it Evoke for lands?

Something like: you may play this land with flash. If you do exile this card at the beginning of the next end phase.
or Exile it after it becomes tapped for mana.

I'd have to say I like Landflash

I do agree with sacrificing the flashed in land at EoT to balance it a bit. Coming in tapped would solve the problem too, but it depowers it a lot and defeats the way it was intended to play.

The mechanic opens up some fun ETB design space, never mind the cards that would have to exist to balance them...It might open up a door to reprint Stifle

For landflash, there is nothing wrong with lands being highly played. abur duals, fetches, and shocklands are all played an enormous amount in there respective formats. Besides, they would probably not occur as 4-ofs simply because they only tap for one color of mana, though you could make duals that come into play tapped.