They come with a level up mechanic where you can pay mana into it to get increasingly better buffs
Nissa, Vital Force Nissa, Vital Force has always stood out as a prominent planeswalker in my mind because you can ultimate it the turn after you play, or even sooner with cards like Pir, Imaginative Rascal
Well, okay, its an Explore with a 1/1 body attached, but value is value
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Persuasive Interrogators If I can investigate, make five Clues and then play this, all I need is 10 mana to win the game. I think these Persuasive Interrogators have given you Stockholm Syndrome
We got Aunt May, Spider-Cat, and a couple of variants of the main man himself