Kasai, Burning Ash

Partner
Landfall-Whenever a land enters the battlefield
put a +1/+1 counter on a land you control. If
that land is a Mountain, Kasai, Burning Ash deals
2 damage to target creature as well.
{2}{r}{t}: Kasai, Burning Ash deals X damage to Creatures your opponents where X is the number
of lands you control with +1/+1 Counters on
them.