Slimefoot and Squee
Slimefoot and Squee is allowing players to activate its second ability when it is in the command zone and not in the graveyard. This is incorrect behavior and allowing opponents an unfair advantage.
[Deleted User] commented
Was it in the command zone? Your opponent may have opted to leave it in the graveyard, and Arena shows, that the card can be used for kits ability. You may have misinterpreted what was shown.