Just had this happen in the midweek standard event with the domain deck. Leyline Binding's domain feature worked just fine, but Herd Migration's cost didn't change at all. Even once it would let me cast it, it still took all 7 mana. I've had a similar issue with the instant side of Heartflame Duelist not registering as an allowable cast even with the mana available.
Just had this happen in the midweek standard event with the domain deck. Leyline Binding's domain feature worked just fine, but Herd Migration's cost didn't change at all. Even once it would let me cast it, it still took all 7 mana. I've had a similar issue with the instant side of Heartflame Duelist not registering as an allowable cast even with the mana available.