The heavy hitters like Progenitus or Hexdrinker are very resilient outside of wrath or sacrifice effects, so I always pack sacrifice effects, like Accursed Marauder, To The Slaughter, or Grave Pact
Its worth noting that Malcators Golems contribute to his second ability, so you only need two more artifacts to enter play the turn you play him to trigger his second ability
The damage from Blow is something you can abuse or combine with first strike or normal creature damage respectively as well giving it slightly better ability to take out big things
In black, using Bargain should be easy to make Candy Grapple an all-star removal card that can hit nearly any creature in the deck aside from massive finishers in green like Hamlet Glutton
The flavor is a little off, but the mechanic played well, was generally liked, and clearly ties into Zendikar's land theme