Burn by Numbers

As an additional cost to cast this spell, sacrifice a creature.
Add X mana in any combination of Black and/or Red, where X is the sacrificed creature's mana value.

Whenever you cast a multicolored spell, create a tapped Powerburn token. It's an artifact with "Tap: Add Colorless."
Sacrifice a permanent: Look at the top two cards of your library. Put up to one of them into your hand and the rest on the bottom of your library in a random order.