Urza's Incubator [Commander Anthology Volume II] Friday Night Magic 2008 the sliver queen is actually

the sliver queen is actually freer than most of Rath's denizens

Set: Beta Edition Type: Artifact Rarity: Uncommon Cost: {1} Whenever a player casts a white spell

Set: Legends Type: Instant Rarity: Uncommon Cost: {W} One or more target creatures become white until end of turn

Set: Alpha Edition Type: Enchantment — Aura Rarity: Common Cost: {U}{U} Enchant land

then discards three cards

Urza's Incubator [Commander Anthology Volume II] Friday Night Magic 2008 the sliver queen is actuallySet: Commander Anthology Volume II Type: Artifact Rarity: Rare Cost: {3} As Urza's Incubator enters the battlefield, choose a creature type. Creature spells of the chosen type cost {2} less to cast. "Stop thinking like an artificer, Urza, and start thinking like a father!" Rayne, chancellor of the Tolarian Academy