On Jan 5, 2022, match 245494095 game 785252840 I experianced the same bug where Puca's Mischief did not detect a target, it said "no legal targets on my upkeep" but there were legal targets on the battlefield at the time. Later in the game the card did function correctly.

match 244662102 Game 781851158 on 06Dec2021 10est encourntered ssame bug

match 244558541 game 781451760 on 02Dec2021 same bug

match 244557792 game 781448770 in 02Dec2021, 1242am est I encountered a bug where Puca's Mischief says "no legal targets" when there were indeed legal targets

match 244531740 game 781346860 on 30Nov2021 at 906pm est I experienced the same bug as before where Puca's Mischief says "no legal targets" when there are legal targets on my upkeep

11/15/2021 still bugged, losing games all the times Puca's mischief says "no legal targets" when there were legal targets match 244175409 game 779960092

match 244058997 Game 779509224
Bug "no legal targets" when there are legal targets from pucas mischief

match 244058372 game 779506692 on 10Nov2021
still bugged after the update

Match 243883599 Game 778796550
Puca's Mischief said "no legal targets" when there were legal targets

match 243762085 Game 778296770 bug also happened

Match 243761844 also happened