Im a big fan of this creature as she seems to have little to no downside
Effect: Converge mechanic allows searching your library for creature, instant, or sorcery cards with mana value up to the number of colors spent, exiling and potentially casting them for free
Due to the low mana cost and ubiquity of Time Vault and a Key, this artifact has seen many well-deserved bans and rarely even makes it into Vintage Cubes
Hall of Famer David Humphreys was the first to really abuse Recurring Nightmare with the untap mechanic in Urzas Saga
This isnt even all the leaks that have occurred over the years
Cards like Skill Drain, Summon Limit, Anti-Spell Fragrance, Gozen Match, and Rivalry of the Warlords are all powerful Continuous Traps since they either stop monsters from being summoned, using their effects, or limit the combination of cards that can be on the field at any time