During a game of Commander Alvin controls Chance Encounter and Frenetic Efreet. The ruling for Chance encounter says “ You can only win a coin flip if you are the player flipping the coin. Your opponent losing a flip does not count as you winning one.” So while you are flipping the coin for Efreet's effect your opponent is making the call, does it still count as a win if your opponent gets the flip wrong?

Edited Brock Ullom (Nov. 18, 2016 06:40:36 PM)

While Frenetic Efreet's printed text may talk about the opponent calling the flip, the printed text doesn't actually matter, because the wording that matters is the official Oracle wording as found in its Gatherer entry, which does no such thing–it reads:

{0}: Flip a coin. If you win the flip, Frenetic Efreet phases out. If you lose the flip, sacrifice Frenetic Efreet.

The player who controls the ability (Alvin, in this case), as the affected player, is the one who calls it, and they're the one who wins or loses it–no other player is involved.