Symbiotic Exoskeleton

Enchantment - Aura
Enchant creature
Enchanted creature gets +2/+2.

: Regenerate enchanted creature.
When Symbiotic Exoskeleton is put into a graveyard from play or from the stack, draw a card.
They've been trying to make creature enchantments playable and not inherently card disadvantage with varying success for a while now. This is one execution that when I thought of it I was actually shocked it hasn't been done yet. The fact that it deals with either itself being countered or the creature being killed in response, or the creature eventually leaving play is fitting for green I think. I know I'd want to play with this.
Current wording:
Symbiotic Exoskeleton

Enchantment - Aura
Enchant creature
Enchanted creature gets +2/+2.
: Regenerate enchanted creature.
When Symbiotic Exoskeleton is put into a graveyard from play or from the stack, draw a card.