Gravattack

Whenever a land is played, Gravattack's controller put a +1/+1 counter on target land.

When a land has a +1/+1 counter on it, it gains indestructible.

{1}: Move a +1/+1 counter from land you control, to target creature. If it is Gravattack, he becomes a land in addition to his other types.

{t}: Remove a +1/+1 counter from Gravattack. Create one mana of chosen color.