Unable to use an instant even though I had the mana available.
I had a white instant from the most recent set that cost 1W to cast that did 5 points of damage to an attacking or blocking creature and if I showed a Dragon I would gain two life. Twice during my match I wasn't given the option to play them and it lost me the match.
5
votes
Jacko#18337
shared this idea
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Rezzahan#77802
commented
Your opponent probably had a Voice of Victory on the field.