Corruptive Influence

Bestow {3}{b}{b} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature you
don't control. It becomes a creature again if it's not attached to a creature.)
Enchanted creature gets +0/+1 and has hexproof, and creatures controlled by enchanted creature's controller have wither.
As long as Corruptive Influence is a creature, it has hexproof and creatures controlled by its controller have wither.