Flash Conscription — ruling 1

If white mana was paid, the player who controls the creature when it deals combat damage will be the one who gains life.

Flash Conscription : règles, fonctionnement et interactions (MTG)

Flash Conscription is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn. If was spent to cast this spell, the creature gains "Whenever this creature deals combat damage, you gain that much life" until end of turn.

How it works : Flash Conscription

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2005· Wizards of the Coast
If white mana was paid, the player who controls the creature when it deals combat damage will be the one who gains life.
No other card is named in this ruling.