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They can cast that person's spell with any color of mana

This isnt depicting the typical My Adventures with Superman Palafin, this is The Boys Palafin. The bubbles rising in the foreground and pod of Finizen swimming upwards in the back give the illustration a sense of movement even while Palafin just stands there, menacingly

It Has An Effect To Protect Allies From Being Targeted By Attacks Or Effects, And When Monsters Battle, It Seals The Activation Of The Effects Of Opponent Monsters

This attack ignores all effects on your opponents Active Pokmon

Thats just not how games of Limited go

What set is Steadfast Unicorn from