Chansey - 3/102 (Base Set) 1999
It becomes 3 damage if you control 3+ Snow permanents
It allows you to decide how your Merfolk get buffed
Shutting down their ability to activate the Blocker keyword means high-power win conditions like Rayleigh , Shanks , and Gol D.Roger can attack the opponents Leader without worrying about a Blocker standing in their way
Creature (47) 1x Alrund, God of the Cosmos Flip 1x Athreos, God of Passage 1x Athreos, Shroud-Veiled 1x Birgi, God of Storytelling Flip 1x Bontu the Glorified 1x Cosima, God of the Voyage Flip 1x Egon, God of Death Flip 1x Ephara, God of the Polis 1x Erebos, Bleak-Hearted 1x Erebos, God of the Dead 1x Esika, God of the Tree Flip 1x God-Eternal Bontu 1x God-Eternal Kefnet 1x God-Eternal Oketra 1x God-Eternal Rhonas 1x Halvar, God of Battle Flip 1x Hazoret the Fervent 1x Heliod, God of the Sun 1x Heliod, Sun-Crowned 1x Ilharg, the Raze-Boar 1x Iroas, God of Victory *list* 1x Jorn, God of Winter Flip 1x Karametra, God of Harvests *f-etch* 1x Kefnet the Mindful 1x Keranos, God of Storms 1x Klothys, God of Destiny 1x Kolvori, God of Kinship Flip 1x Kruphix, God of Horizons 1x Mogis, God of Slaughter 1x Nylea, God of the Hunt 1x Nylea, Keen-Eyed 1x Oketra the True 1x Pharika, God of Affliction 1x Phenax, God of Deception 1x Purphoros, Bronze-Blooded 1x Purphoros, God of the Forge 1x Reidane, God of the Worthy Flip 1x Rhonas the Indomitable 1x Tergrid, God of Fright Flip 1x Thassa, Deep-Dwelling 1x Thassa, God of the Sea 1x The Locust God 1x The Scarab God 1x The Scorpion God 1x Toralf, God of Fury Flip 1x Valki, God of Lies Flip 1x Xenagos, God of Revels
How about seven of them
