Sakashima the Impostor [Mystery Booster] Draft Booster Young Conquerer enters the battlefield

Young Conquerer enters the battlefield

Set: HeartGold & SoulSilver: Triumphant Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Set: Betrayers of Kamigawa Type: Instant — Arcane Rarity: Rare Cost: {X}{U}{U} You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost

Set: International Collectors' Edition Type: Creature — Demon Rarity: Rare Cost: {4}{B}{B}{B} Flying

Thus the volume you hold was written

Sakashima the Impostor [Mystery Booster] Draft Booster Young Conquerer enters the battlefieldSet: Mystery Booster Type: Legendary Creature Human Rogue Rarity: Rare Cost: {2}{U}{U} You may have Sakashima the Impostor enter the battlefield as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has "{2}{U}{U}: Return this creature to its owner's hand at the beginning of the next end step."