None of that is truly what makes Blastoise such a powerful card, though
The face-down card put onto the battlefield by Curator Beastie's last ability is a colorless creature you control entering the battlefield (unless an effect gives it a color) so it will enter with +1/+1 counters if Curator Beastie is still on the battlefield
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Rosas Encouragement, Tarragon, Growing Grass Energy, Rocky Fighting Energy, Telepathic Psychic Energy, Energy Recycler, Forest of Vitality, Sacred Ash, Wondrous Patch
In this bracket I found Aether Adept to be the most cuttable
Strengths and Weaknesses The most compelling reason to play Four-Color Yorion right now is how effectively it plays against creature decks