Doom Tree

{t}: Add {u}, {b}, {r}, or {g} to your mana pool.

Whenever a creature is sacrificed, Doom Tree gains life equal to the sacrificed creature’s power.

{4}, {t}: Each player sacrifices a creature. Create a 2/2 green Treefolk creature token for each creature sacrificed this way.

Whenever you cast a creature spell, you may sacrifice a Treefolk creature you control. If you do, draw a card, and Doom Tree gets +1/+1 until end of turn.