Flash Conscription

Instant, 5R (6)
Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn. If {W} was spent to cast Flash Conscription, the creature gains "Whenever this creature deals combat damage, you gain that much life" until end of turn.¹
Illus. Stephen Tappin

Gatherer Card Rulings [Nov 2009]

• 10/1/2005: If white mana was paid, the player who controls the creature when it deals combat damage will be the one who gains life.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/9)	Ravnica: City of Guilds (Uncommon)