I had underworld cerberus in my graveyard. Opponent casts Grafdigger cage. Exiles cerberus from the graveyard, cerberus ability makes it return to graveyard. But grafdigger cage exiles all cards entering graveyard. This creates an infinite loop and the game locked up.
Hello @redryder Sorry about the delay and thank you for your feedback! This issue is now under investigation.
Thank you for your patience, Marcela.