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In February 2022 a Mulligan rule was added

This cards combination of nostalgia, playability, and scarcity makes it a centerpiece for serious collectors

When this card is Normal Summoned: You can Special Summon 1 Level 3 Fiend monster from your hand or Deck, but it has its effects negated, also it cannot be used as Synchro Material

The latter one makes a 1/1 flying Spirit to block or swing, but if you are the Monarch that'll be a 4/4 Angel instead

Kaya, Geist Hunter strikes me as something on the weaker end of playability, but its worth trying in a deck that can generate tokens

Tribute 1 monster your opponent controls