{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.
Legalities
tlrlegal
duellegal
brawlnot legal
pennylegal
PreDH
Rulings · 2
wotc
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.
wotc
Until the ability that turns the Keyrune into a creature resolves, the Keyrune is colorless.
Notes
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