Ymir, the First Being

First strike, trample, reach
At the beginning of you upkeep, put two
1/1 Human creature tokens onto the battlefield.
When Ymir, the First Being dies, exile it. You
may search your library for a Plains, an Island,
a Swamp, a Mountain, and a Forest. If you do,
put one of those onto the battlefield and the rest
into your hand.