Calvin the Imaginative

When Calvin the Imaginative enters the battlefield, create a legendary 2/2 red and white
Beast creature token named Hobbes the
Ferocious.
At the beginning of your upkeep, choose one:
- Replicate X
- Overload X
- Jump-start X
Instants and Sorceries that you cast gain the
chosen ability until end of turn where X equals
twice that spells converted mana cost.