The Marvelous Scientist [Un-Known Event Playtest Cards]

As this creature enters the battlefield, choose cosplay or science.

Cosplay — Whenever you cast a creature or planeswalker spell, this creature's base power and toughness each become equal to that spell's mana value until end of turn.

Science — Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent.