Ballroom Brawlers triggered ability gets countered incorrectly
Ballroom Brawlers targets another creature (up to 1 creature trigger), the other creature gets killed, the ability gets countered. This is a bug since the ability should be valid with 0 targets.
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L4Z3#96790 commented
So I had the same thing today, where I attacked with my only two creatures Ballroom Brawlers and Freelance Muscle into my opponent's board of four creatures. Before my triggers went off the opponent killed my Freelance Muscle with Kill Shot. Which led to my Ballroom Brawler trigger getting countered and me not gaining lifelink or first strike. It was quite frustrating considering the board state.
Sadly I didn't make a screenshot at the time. However it should be easy to reproduce.