Scion of the Ur-Dragon [Time Spiral] Deckmasters cast it for its madness

cast it for its madness cost or put it into your graveyard

It contains the totality of Alhammarret's notes

Set: Ravnica: City of Guilds Type: Instant Rarity: Rare Cost: {X}{G}{G}{G} Convoke (Your creatures can help cast this spell

While it's phased out

Scion of the Ur-Dragon [Time Spiral] Deckmasters cast it for its madnessSet: 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."