Stupid Sexy Magic

If I had to make a spell-system for Oglaf , it would be this:

• You can only cast spells with a level equal or higher than the last spell you cast.
• Once you cast a spell, you cannot cast it again for a number of rounds equal to its level.

You want to cast Fireball? Let's warm up with a cantrip first. Yea, Burning Hands works!

Acid Arrow? Yea, that's some proper magic!

Fireball already? Really? It'll be your last spell! What about another second-level spell: Enlarge?

You only have those two second-level spells so you can't cast another; let's see that Fireball!