Treehill

Landfall— Whenever a land enters the battlefield
under your control, put three +1/+1 counters on Treehill and it becomes a 0/0 creature with
trample, haste and vigilance until end of turn.
{3}; Remove a +1/+1 counter from Treehill. It
becomes a 0/0 creature with trample, haste and vigilance until end of turn.