Mono-Green Showstopper!

: Target creature blocks this creature this turn if able. Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

Enchant creature All creatures able to block enchanted creature do so.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.) : Regenerate enchanted creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)