altered ks booster box TCG - Beyond the Gates (KS Edition) choose a faction and lead your expeditions through an ever Altered: Trial by Frost Booster

Maybe not a game-ending spell for Standard or limited play, but in Commander

Special Summon 1 "Snake-Eye" monster from your hand or Deck, except "Snake-Eye Birch"

3 Mewtwo ex A Very Different Vibe From Mew All of the cuteness is gone when you pull this Mewtwo ex card

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Its also worth noting that, as a saga, you can flicker it or otherwise mess with the counters to create a nearly unbeatable Kraken engine or tap your opponents board forever

This is before talking about Argyro Systems ability to send cards to the graveyard and cycle cards between fields of play, or Therion Cross ability as a trap card to negate and/or banish an opponents monster effect