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On top of that I would add something to represent his ability " When Festering Goblin dies, target creature gets -1/-1 until end of turn

Vampire isnt the most relevant creature type, but its definitely one that you can support and Bloodthirsty Adversary is going to be one of the nicer cards for a Cube trying to do so

Playing it in my Old Stickfingers deck has increased its value, as the ability also feeds the graveyard (and makes me want to jam it into any Karador, Ghost Chieftain deck)

Powerstone Artifact Ramp Powerstone tokens are interesting because they produce mana that can't be used for any nonartifact spell