Nothing really to say about this other than token decks will love it more than this deck will, and while I dont think it will be expensive, Id keep an eye out to add it to your collection if you like tokens and have a White/X deck with them
(2019-08-23) "Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." (2021-03-19) You must still follow any timing restrictions and permissions, including those based on the card's type
When I talked with Aaron about this, he managed to find them, so here are the actual initial cards he designed: Acidic Atmosphere 6 Artifact Each creature gets -1/-1 for each colored mana symbol in its mana cost
Not only does this Summon create a 9/9, but it can remove permanents, trigger card draw, and use Mega Flare to essentially finish a game of Commander
Sun Titan provides value immediately and repeatedly
There's probably some tricks that can be pulled off exploiting big creatures for massive life gain
