yugioh monster revival cards Spell Card Reborn - INFO-EN099 - Super Rare it cannot attack and neither player can activate its effects Yu-Gi-Oh! Wiki - Revival Rose

This would be good even if it could never transform, and transforming it is actually very doable, since it spits out Wizard tokens and is a Wizard itself

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Once per turn you may activate one of these effects

The answer is that you simply cant

They mutate into the creature on top plus all abilities from under it.) Flash Flying Whenever this creature mutates, destroy target creature or planeswalker an opponent controls

Sephiroth, Fabled SOLDIER is a clear standout with his powerful abilities, especially with all the various ways to ensure multiple creatures hit the graveyard in a single turn and enable his transformationpair him with Ardyn or Garland/Chaos, and youll have an intimidating presence on the board