Tamiyo, Inquisitive Student // Tamiyo, Seasoned Scholar

The transform trigger is the design that makes this one strange: draw your third card in a turn and Tamiyo exiles herself, returning as a planeswalker you assembled out of a busy turn rather than one you cast. Her front side is a one-mana 0/3 flier that investigates on each attack, a durable early blocker whose Clue tokens convert to cards once you can spare the two mana to crack them. Her ceiling is measured in how easily a deck banks two extra draws in a turn: a pair of cheap cantrips, a burst of selection, a wheel effect, and the flip resolves before you have spent much effort chasing it. That structure rewards decks built around raw card volume rather than around Tamiyo herself, a subtler ask than the usual protect-the-walker template.

The back half then behaves like a value planeswalker that has already covered its own entry fee. The +2 buys defensive time by shrinking incoming attackers, the −3 rebuys an instant or sorcery (and adds a mana of any color if that card is green, quietly nudging her toward a spell-heavy Sultai or Simic shell), and the ultimate refills half your deck with a no-maximum-hand-size emblem to hold it. None of that planeswalker text needs to justify a slot, because the creature side earned it as a one-drop. The transform is upside layered onto a card that was already playable before it flipped, a harder trick than a strong walker stapled to a weak front face.