My opponent had “Eirdu, Carrier of the Dawn” in play. I resolved a “Curious Colossus”, removing all abilities from my opponent's creatures. However, my opponent's creatures in hand still had convoke, and my opponent was able to play more spells than should have been possible. My opponent had 7 cards in hand, so this ended up allowing them to cast many spells.

I have attached images showing “Eirdu” with its abilities removed, along with my opponent convoking to cast a creature and an image showing a creature on the stack with convoke.