Is this the first event that becomes unwinnable if you don’t include certain cards in your deck? Usually certain cards are needed for full points (Cast X Snow cards, Boast 4 times, etc), but I can’t think of an event where you couldn’t damage Greg at all without certain cards.
This weekend’s games were unwinnable if you didn’t have Outlaws (for the megabombs) or support hate. Granted, that’s a low bar to overcome. But the objectives (deal 20 damage, gain 15 life) didn’t hint that either would be needed. If certain types of cards are needed to be able to win a match, that needs to be crystal clear ahead of time. Most people look at objectives, but not rules ahead of time. I know I never look at permanent supports ahead of time; most just haven’t had that much impact. And the ones that did made things difficult, not impossible.
And for the record, I scored perfect in the event (I had Teferi, Hero of Dominaria in my deck, so was able to exile the support), so this isn’t sour grapes. But an event shouldn’t be unwinnable without certain cards.