Plaguist

Trample, Hexproof
at your upkeep sacrifice, your opponent's creature.
Plaguist gets +1+1 counters
equal to that creature's power.
At your end step create Eldrazi scion tokens
equal to the number of +1+1 counters on Plaguist.
If you control over 40 Eldrazi scion
tokens you win the game.