Quote:
It won't stay around through multiple turns. It will only stay around through the steps and phases in a turn, so, for example, you could tap all of your forests during the declare blockers step, so that the thing is pumped for combat, and then use the mana during your second main phase. It seems to be just a worse timbermaw larva because it will require you to tap down all of your green mana every turn (which makes it hard to hide battletricks if you want to use one on your opponents turn after you attacked on yours), although you will be able to use it on defense if you want.
Yeah I think it won't go past turns but if it does:
Fragile but entertaining way to win would be building him up to collect enough mana by turn 4 so that you can tap enough for a winning Banefire turn 5:
Forrest, Llanowar Elves, go
Forrest, Archdruid, go
Forrest, Two Elves (who combined need to be able to make one mana), cast this guy with the Archdruid mana (2/2; one mana in pool)
Forrest, 4+1+1(or more)+4 into the pool (11+)
Mountain, Tap the rest, Banefire