Ken Sugimoris sleepy giant, paired with the Thick Skinned Power that shrugged off Sleep, Confusion, Paralysis, and Poison, is pure nostalgia in card form
Every spell someone casts must be assessed on whether it's really worth one more mana or potentially giving you a card you could win the game with, and that's a lot of cognitive load to put on a player already trying to plan their turn
And no, youre not supposed to know what your Prize cards are, so no peeking
120 damage is also a great damage benchmark to hit, as Yanmega ex can also OHKO most non-ex Basic Pokemon and 2HKO most ex Pokemon
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Creating two extra creatures for 1 mana is pretty good, and even better if youre running token doublers