The Marvelous Scientist (UNK-RZ04J) [Unknown Event]

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.