Harken Grasswalker

Harken has Hexproof while he's untapped.
At the beginning of each upkeep, choose target card
in your graveyard and exile it.
On your turn, you may cast or play one card exiled
by Harken.
{t}: Deal 1 damage to any target. If that target is a creature that dies from this effect, you may cast or
play an additional card exiled by Harken this turn.

"All of human history in the palm of my hand."