Yaltma, the plane linker

Yaltma, the plane linker enters the battlefield
tapped.
{t} add one mana of any colour.
whenever a opponent plays a land deal one
damage to that player.
tap a creature of each colour: Yaltma, the plane
linker becomes a 7/7 tree elemental with trample.
Yaltma, the plane linker can be your commander.