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What attacks does Pikachu have

Otherwise youre looking at just a handful of cards that can reasonably be called board wipes

Its a lot of mana to drain them, and you cant even always do it, and its hard to evaluate how good it is to scry whenever a creature dies

Lotus R3 Geis Grinder Golem N1 Hell Grave Squirmer N3 Shabara N1 Shyama N1 Abominable Unchained Soul N1 Unchained Soul of Disaster SR1 magic Nightmare Athrone SR3 Nightmare Pain R3 Mature Chronicle N1 Dark Beckoning Beast N3 Opening of the Spirit Gates N3 Super Polymerization N2 trap Escape of the Unchained N1 Eternal Favourite R3 EX Yubel-Das Ewig Liebe Wchter UR3 Mudragon of the Swamp SR1 Starving Venom Fusion Dragon N1 Predaplant Dragostapelia SR1 King Yama SR2 Unchained Soul of Anguish R1 Unchained Soul of Rage R1 Unchained Abomination N1 Linkuriboh N1 Salamangreat Almiraj SR1 Superdreadnought Rail Cannon Gustav Max N1 Psychic-Valdrus UR1 #Super Polymerization is not 12 worlds

Then I'd make it cost five mana