The Water Crystal 333 (FINAL FANTASY) - Foil Slime Sovereign you may cast a spell

you may cast a spell from among cards exiled with this enchantment without paying its mana cost

(It's affected by summoning sickness

Sigil of Corruption — When you lose control of Khârn the Betrayer

Edelstein gets +X Power until end of turn

(Apply this effect only if your champion's class matches this card's class) [Class Bonus] Other allies you control get +1 power as long as they're attacking rested units

The Water Crystal 333 (FINAL FANTASY) - Foil Slime Sovereign you may cast a spellBlue spells you cast cost {1} less to cast. If an opponent would mill one or more cards, they mill that many cards plus four instead. {4}{U}{U}, {T}: Each opponent mills cards equal to the number of cards in your hand.