Regeneration [Fifth Edition] Cat Serum was once derived from

Serum was once derived from Mirrodin's blinkmoths

Set: Battlebond Type: Creature — Goblin Rarity: Common Cost: {3}{R} When Stadium Vendors enters the battlefield

Set: Premium Deck Series: Graveborn Type: Creature — Elemental Rarity: Rare Cost: {5}{G}{G}{G} At the beginning of each upkeep

When Village Bell-Ringer enters the battlefield

Cursed Type: Creature — Human Scout Rarity: Uncommon Cost: {2}{U} Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield

Regeneration [Fifth Edition] Cat Serum was once derived fromSet: Fifth 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.)