Death by Vanilla Bug
I have won 3 brawl games inwhich I have cast only creatures with no abilities(and no creatures at all) and the achievement for the Yargle Day has not been completed.
19
votes
Contractcloser#95208
shared this idea
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Muggle_of_the_Coast#19144
commented
See https://magicthegatheringarena.statuspage.io/ : There's a fix planned for tomorrow.