Cheapest priced copy (Return to Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Izzet Keyrune 
Artifact · Uncommon · Return to Ravnica · #230
{T}: Add {U} or {R}.
{U}{R}: Until end of turn, this artifact becomes a 2/1 blue and red Elemental artifact creature.
Whenever this artifact deals combat damage to a player, you may draw a card. If you do, discard a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 230 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2012If Izzet Keyrune becomes a creature in a way other than its own activated ability, its last ability will still work.
- 15 April 2013Activating 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.
- 15 April 2013Until the ability that turns the Keyrune into a creature resolves, the Keyrune is colorless.