FOILCheapest priced copy (Commander 2017): $7.49 at Card Kingdom, near mint, their price list as of .
Scion of the Ur-Dragon 
Legendary Creature — Dragon Avatar · 4/4 · Rare · Secret Lair Drop · #1531
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.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $7.49 to $119.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2017 | 192 | Rare | $7.49 | — |
| Secret Lair Drop | 1531 | Rare | — | $29.99 |
| Time Spiral | 246 | Rare | $7.99 | $119.99 |
2 rulings from Wizards of the Coast
- 25 September 2006Removing the other Dragon card from your graveyard has no effect on Scion of the Ur-Dragon.
- 25 September 2006When Scion of the Ur-Dragon becomes a copy of another Dragon, it loses its copy ability for the rest of the turn.