Aen, Wandering Warlord

Trample, double strike
Whenever Aen, Wandering Warlord deals combat damage to a player, you may search your library
for a basic Forest or Mountain and put it onto
the battlefield.
When you play your second land each turn, you
may pay {r/g}{r/g}. If you do, Aen deals 3 damage to
any target.