Couldnt cast Fatal Grudge for some reason, cost me the game!
I had a pact weapon my opponent just couldnt manage to get off of a creature even though i was at -41. I had a Halo fountain for a while but not enough white mana to win the game. he finally got one and played it, the next turn he could use it to win the game after declaring attackers. i tried to use my fatal grudge to sacrifice my halo fountain (since it was my only pure artifact and my opponent happened to have only 1 artifact in play, the halo fountain). I could not cast the spell even though I had enough mana. I let the attack phase go, played something else, still couldnt play it. the additional cost is a sacrifice and it wouldnt allow for anything i had to be used as part of that cost.
I remember this happening with another card recently also but will report that when I remember that one also. I hope this will help fix it, thank you.
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[Deleted User] commented
The reason is your opponents Yasharn