
At the beginning of combat on your turn, up to one target land you control becomes an X/X Elemental creature with trample and haste until end of turn, where X is Obuun's power. It's still a land.
Landfall — Whenever a land you control enters, put a +1/+1 counter on target creature.
Obuun, Mul Daya Ancestor has 3 printings, first in Zendikar Rising Commander (2020). EDHREC ranks it #10,996 among Commander cards. It appears most in Toph, the First Metalbender decks (2,788 on EDHREC). 1 public deck on TCG runs it. It has 6 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.