Obuun, Mul Daya Ancestor {1}{R}{G}{W}
Legendary Creature — Elf Spirit
Identity
Naya
EDHREC rank
#10,893
Cheapest printing
US$0.43
TCGplayer
Printings
2
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.
Keywords: landfall
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.