Obelisk of Undoing [Antiquities] White Sacrifice this artifact: Add one

Sacrifice this artifact: Add one mana of any color

−2: Gain control of target artifact

Sacrifice Aura of Silence: Destroy target artifact or enchantment

Set: Portal Three Kingdoms Type: Instant Rarity: Uncommon Cost: {W} Cast this spell only during the declare attackers step and only if you've been attacked this step

Set: Beta Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {2}{B}{B} Enchant land

Obelisk of Undoing [Antiquities] White Sacrifice this artifact: Add oneSet: Antiquities Type: Artifact Rarity: Rare Cost: {1} {6}, {T}: Return target permanent you both own and control to your hand. The Battle of Tomakul taught Urza not to rely on fickle reinforcements.