Rakdos Keyrune

three generic mana Artifact

tap this permanent : Add one black mana or one red mana .

one black mana one red mana : 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.

Showing Return to Ravnica#232

Price

0.24 $

Foil 0.65 $

17 printings · up to 0.29 $

Daily estimate from Scryfall, not a shop quote.

2013-04-15
Until the ability that turns the Keyrune into a creature resolves, the Keyrune is colorless.
2013-04-15
Activating the ability that turns the Keyrune into a creature while it's already a creature will override any effects that set its power and/or toughness to another number, but effects that modify power and/or toughness without directly setting them will still apply.