Ravos, Devouring Flame

Haste, protection from blue
Whenever a Mountain enters the battlefield
under your control, if Ravos is in the command
zone or on the battlefield, you may sacrifice that
land. If you do, Ravos deals 2 damage to any
target.
{2}{r}{r}, Sacrifice two Mountains: Ravos gets
+4/+0 and gains first strike until end of turn.