Scion of the Ur-Dragon [Time Spiral] Alliances and the sea takes

and the sea takes

Set: Rise of the Eldrazi Type: Creature — Hydra Rarity: Mythic Cost: {G}{G}{G}{G}{G}{G}{G}{G} This spell costs {G} less to cast for each green creature you control

Set: Unlimited Edition Type: Instant Rarity: Uncommon Cost: {B} As an additional cost to cast this spell

yet it opened many doors

Scion of the Ur-Dragon [Time Spiral] Alliances and the sea takesSet: Time Spiral Type: Legendary Creature Dragon Avatar Rarity: Rare Cost: {W}{U}{B}{R}{G} Flying {2}: Search your library for a Dragon permanent card and put it into your graveyard. If you do, Scion of the Ur Dragon becomes a copy of that card until end of turn. Then shuffle. "I am the blood of the ur dragon, coursing through all dragonkind."