literally just the best friend of Shiranui/Metaphys) Aleister's entire Deck, really, bar Overdrive (nothing of note, actually, except a monster that fills your entire field with Tokens on-Summon, and a card that makes 2-4 Token copies of Level 3 or lower Normal Machines) One-off destruction cards Power Balance (if your opponent attacks with an even number of cards in their hand, and there are no cards in your hand, they discard half their hand and you draw cards equal to the amount they discarded) Shadow Balance (Basically Evenly Matched, but it destroys, only counts monsters, and you choose which ones they keep) Attack negation cards of varying quality, the best being Kaiba's Command Silencer (Quick-Play Spell that negates an attack and draws you a card) Zombie's Jewel (grabs any Spell from your opponent's Graveyard by letting your opponent draw 1) Plasma Eel (A Machine Dupe target that can't be destroyed by battle) Magical Trick Mirror (Activates any Spell Card from the Graveyard in response to an opponent's attack, can occasionally do weird things) Negative Energy Generator (triples a DARK monster's ATK) Normal monsters of varying quality A Quick-Play Spell that makes you discard your hand to excavate the top card of your Deck, and if it's a Spell, its effects are immediately activated (think a faster Diamond Dude- it ignores costs, but not conditions) Couple random Weevil cards Some of Noah's nonsense Some of Dartz's cards Bakura's burn/mill/stall stuff (eg, Horrible Earthbound, a card that burns your opponent for 500 when an attack is declared, meaning that replay actually does extra damage

It gets more efficient the more mana you have, which is why it seems to be a better option as a large X spell finisher than most
However, all it takes for a set to be good is one broken card
ZEXAL was completely bonkers
Forbidden Cards Forbidden Pot of Greed X SPELL Draw 2 cards
Decks With This Card Recent public and tournament decks using Toon Summoned Skull