Breeding Pool [Dissension] Serpent Scion of the Ur-Dragon becomes

Scion of the Ur-Dragon becomes a copy of that card until end of turn

Set: Urza's Legacy Type: Artifact Rarity: Rare Cost: {3} No more than two creatures can attack you each combat

Set: Amonkhet Prerelease Promos Type: Enchantment — Aura Curse Rarity: Mythic Cost: {5}{B}{B} Enchant player

{1}{G}{W}{U}: Put Derevi onto the battlefield from the command zone

Set: Seventh Edition Type: Enchantment Rarity: Uncommon Cost: {2}{B} As Engineered Plague enters the battlefield

Breeding Pool [Dissension] Serpent Scion of the Ur-Dragon becomesSet: Dissension Type: Land Forest Island Rarity: Rare ({T}: Add {G} or {U}.) As Breeding Pool enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.