You want to focus on big, impactful creatures that really shake up the board state upon entering the field, and who can continue to disrupt the game as long as they are on the field (or, possibly, by coming back from your Graveyard again, and again, and again) Protecting Yourself from an Early Grave, and Knowing Your Match-ups Reanimator decks also dip into forms of spot removal
Cards like Roaring Moon ex are immensely powerful because they can knock out any Pokmon without caring about its HP, while cards like Pecharunt ex are amazing for closing out matches where the opponent has taken a significant amount of prize cards throughout the game
however, their serialized variants are only in Collector Boosters
Theres the whole cycle of Arcbound creatures from Darksteel , any of the sunburst cards like Etched Oracle, or even the classic Triskelion
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