Olakhan, Scourge of Tarkir

Flying, Trample, Haste
When Olarkhan, Scourge of Tarkir enters the battlefield, create 9 3/1 lava-rock tokens with defender and "{t}: put a +1/+1 counter on target lava rock
when you have 20 lava-rock tokens on the battlefield, create a 9/4 volcano token with defender, reach, and "{t}: create 5 2/1 lava-drop tokens with defender and "sacrifice this at the beginning of your end step"
Lava-rock tokens can tap for 1 {b/r} mana to cast this spell