It's an X-cost spell where you can plug in mana to give a creature -X/-X stats, perhaps killing it instantly or else helping you to win a combat
For context: I played the game with two players, Im a huge fan of Disney animation, and while I play a lot of tabletop games, Im not super experienced with trading card games (the only one Ive played for any amount of time is Star Wars: Destiny )
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Pulsemage Advocate asks a lot in exchange for helping you out
Treasure Cove turns Treasure into card draw, though its still a slower process than just running Reckoner Bankbuster
When Contagion Engine ETBs (enters the battlefield), its controller puts a -1/-1 counter on each Creature a target opponent controls
