Regeneration [Alpha Edition] Commander put a +1/+1 counter on

put a +1/+1 counter on Khabál Ghoul for each creature that died this turn

Creatures you control of the chosen type get +1/+1 for each charge counter on Door of Destinies

but they're easy to catch

nonblack creature

Regeneration [Alpha Edition] Commander put a +1/+1 counter onSet: Alpha Edition Type: Enchantment Aura Rarity: Common Cost: {1}{G} Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.) {G}: Regenerate enchanted creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)