Moin,
habe mal im gatherer geschaut, das ganze scheint jedoch nicht klar definiert zu sein, darfst du also vermutlich zu deinen Gunsten auslegen.
Dennoch 2 interessante Ergänzungen zu ihm:
08.06.2018 If an effect has a player flip a coin but refers to whether the flip came up heads or tails, that flip has no winner or loser.
13.07.2018 If an effect has a player flip a coin and refers to winning or losing a flip, only the player who flipped the coin wins or loses the flip. If that player loses the flip, nobody wins the flip.