Rakdos Keyrune | RTR

Rakdos Keyrune is a uncommon Magic: The Gathering Card

Card Text

{T}: Add {B} or {R}.
{B}{R}: This artifact becomes a 3/1 black and red Devil artifact creature with first strike until end of turn.

The Rakdos use it for everything you can think of and plenty more than that.

Artist: Daniel Ljunggren
Set: RTR
Number: 232