Technically manifest dread effects can be accelerated by mana dorks into turn 2 payoffs, like an Omniscience into some sort of make your own Invasion of Arcavios
combo. Feel like making some jank here and see what happens.
So I guess the fastest sequence would be... turn 1 Llanowar Elves, turn 2 Growing Dread manifesting an Omniscience and then Splash Portal it face up. Then if Invasion is in hand, grab a Beseech the Mirror out of the sideboard, tutor for the other Invasion, which grabs the This Town Ain't Big Enough from the sideboard. This Town bounces both Invasions, replay the Invasions to get back This Town and also something else that damages the opponent or mills the opponent out. Breach the Multiverse might be the chunkiest. Loop the Invasions to loop both spells until you win.
That leaves a bunch of deck space to build in backups for the combo pieces.
I want to try Poison Dart Frog as another mana dork. It costs 2 so it slows down the combo a turn but whatever. I like how it's a frog for Splash Portal extra value, and maybe the deathtouch and reach can intimidate the opponent from attacking sometimes, to give you an extra turn or two to get the combo online.
To backup the manifest dread part I want to put in Cursed Windbreaker and Vannifar, Evolved Enigma. The Windbreaker is equippable evasion so maybe it opens up some attack possibility with the 2/2 dread guys. Vannifar can help fix some hands that are overloaded with the high cost cards, and also sometimes buff the 2/2 dread guys into better combat players.
Scrollshift is an obvious blink effect that can also blink the Windbreaker if needed. I also want to try Twining Twins and Kykar, Zephyr Awakener even if they're a bit awkward.
Backup cards for the Omniscience part include One with the Multiverse and Atraxa, Grand Unifier and The World Spell.
I tested a bit and found that I often have some combo pieces ready but the last piece just keeps ending up in the graveyard. So I want a few ways to get graveyard pieces back. I thought about Archmage's Newt but ended up with Sphinx of Forgotten Lore to rescue the spells and Muldrotha, the Gravetide to rescue the permanents. Only one of each, but with Atraxa and World Spell I tend to find them semi-consistently.
Lands are rough but for these kinds of gameplans that need lots of untapped multicolor lands on the early turns, I prefer to go with a Caves package with Forgotten Monument to enable multicolor. I have 20 lands right now, but that was probably better for a deck focused on the fastest possible combo with the lowest casting costs. I should probably bump that up more given I shifted more cards into 3 and 4 costs. But I probably won't because I don't want to take anything out.
