User blog comment:AmazingPST"Providence"/Amazing huh? Personal flags!/@comment-26069426-20150204210453/@comment-4764137-20150204212347

First off, this is far from a 50% chance of failure. Actually, the activating player is most likely to win this, usually. There are 3 possible outcomes of a double coinflip. Heads/Heads, Heads/Tails, and Tails/Tails. It is therefore 67% likely that the activating player will win. You wanna balance it? Use RPS, for one.

Oh, and you forgot to say "Either player may activate this ability"