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7 Wartortle Hiroki Yano $7.99 A World Championship Printing While this version of Wartortle may not be legal to play, it still has a decent backstory to help it become a collector's item

Disable your opponents Bloom Tender, Mother of Runes or Viscera Seer, and give yourself that effect instead

32/102 Kadabra

TCGPlayer has 123 copies listed currently, which is a lot for a card experiencing a spike like this

The format is no stranger to similar cards like Ichor Wellspring, but that card and Mephitic Draught require you to sacrifice them for the extra value

Using the Tenth Doctor card showing David Tennant in the role gives players access to the Allons-y! ability, that allows players to exile nonland cards from their deck and place time counters on them, and the Timey-Wimey ability, enabling players to time travel at the cost of removing time counters from their cards