Acidic Sap Spitter

Bestow {Bg}{Bg} (If you cast this card for its bestow cost, it’s an Aura spell with enchant creature. It becomes a creature if it’s not attacked to a creature.) At the beginning of your end step, if Acidic Sap Spitter is an Aura, put a venom counter on it. Enchanted creature gets -1/-1 for each venom counter on Acidic Sap Spitter. Acidic Sap Spitter gets +1/+1 for each venom counter on it. Each player must choose Acidic Sap Spitter if able when they proliferate. When the enchanted creature dies, return Acidic Sap Spitter to the battlefield under your control with the same number of venom counters it has when it was an aura.