Koldruun, Thorn of the Jungle

Haste, trample, flying, first strike
At the beginning of your upkeep, sacrifice
an artifact and a creature or Koldruun,
Thorn of the Jungle deals 4 damage to you
and it gains menace until end of turn.
"Bring me tribute, human, or you will pay my price, and you know I am... unforgiving."