ARC-V goes so far as to use this trope as Foreshadowing: Sora's Fluffal monsters split apart to reveal blades and demonic eyes when he fuses them into Death Toys, which reflects Sora himself and hints at what's really under that smug child exterior
Their most expensive variant, however, is over 200 times more expensive than that
With all the Ponders, Brainstorms and Preordains Blue has to offer, Polymorph can be a valid choice for spot removal with alternatives
During the End Phase of the turn this card was Summoned: Send it to the Graveyard
However, Yami Marik manifests at that very moment, catches the whip with his bare hand, and proceeds to stab the man to death
If for some reason you want to play a card that is functionally useless in Gym Leader Challenge, you are welcome to include it in your deck