Scion of the Ur-Dragon [Time Spiral] Saproling Whenever a source deals damage

Whenever a source deals damage to Phyrexian Obliterator

Set: Visions Type: Creature — Human Druid Rarity: Rare Cost: {G}{W} Whenever an enchantment is put into a graveyard from the battlefield

As long as Mirri

Set: Arabian Nights Type: Enchantment Rarity: Rare Cost: {G} At the beginning of your upkeep

A force as voracious as time itself

Scion of the Ur-Dragon [Time Spiral] Saproling Whenever a source deals damageSet: 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 your library. "I am the blood of the ur dragon, coursing through all dragonkind."