When convoking creatures with additional casting costs using the effects of Dazzling Theater, I'm getting errors.

When convoking out a Vile Mutilator, the additional casting cost forced me to sacrifice an enchantment, even though I had three creatures in play. That cost me the game in a Duskmourne Premier Draft.

When using the same enchantment to convoke play a Fear of Abduction, it game me an error of "cost can't be payed", even though I had creatures in play that I could exile with it.

In both cases, I was tapping all my existing creatures to pay the convoke.