The one that ends all

{t}: Add one mana of any color to your
mana pool.

When this permanent taps to produce land put an "x" counter on it. When you have ten "x" counters it becomes a 1/1 creature with Flying, Trample, Doublestrike, Lifelink.
"The One That Ends All" gains +2/+2 for each land on the battlefield.
Destroy target land you control target creature gains indestructible.