Creature — Dragon 3/5, 3UR (5)
Rare
Flying
Whenever Spellbound Dragon attacks, draw a card, then discard a card. Spellbound Dragon gets +X/+0 until end of turn, where X is the discarded card's converted mana cost.
A king in Jund, a serf in Esper.
Illus. Jesper Ejsing

5/1/2009: You'll discard a card even if some other effect replaces the draw.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern