I'm a Doctor, Not a . . .

Not legal in this format after release.

Not legal in this format after release.

A one-mana +2/+2 combat swing with a lasting counter is too low-impact and vulnerable to removal without a proven combo or counter shell.

Could be wrong if An efficient untap or Doctor/counter synergy could create a dedicated home.

Legacy generally cannot afford a creature-dependent combat trick that neither protects its target nor generates cards or immediate combo value.

Could be wrong if A niche creature combo could value the one-mana untap and permanent counter.

Elves can use a cheap combat blowout and permanent counter, but a target-dependent trick is unlikely to displace more proactive cards broadly.

Could be wrong if Common-level Doctor or +1/+1-counter support could make its type-changing clause relevant.

It can untap a useful creature while adding a lasting counter, but one-shot combat growth is a low-impact, replaceable effect in optimized multiplayer.

Could be wrong if A commander that specifically rewards Doctors, counters, or repeated untapping could make it a stronger synergy piece.

A one-mana instant that leaves a +1/+1 counter and creates a +2/+2 combat swing is a solid trick, though still exposed to removal.

Could be wrong if Unknown archetypes, removal density, and Doctor synergies could move it substantially.