If they arent enough, Rogues Passage grants unblockability, while Archetype of Courage, Heliod, God of the Sun, Angelic Skirmisher, and Bow of Nylea can grant enough keywords to the team to get them through
Then you draw X cards and lose X life, where X is Chittering Skullspeakers intensity
Rather than being a dead card, this will swell in size by a pair of +1/+1 counters for each opponent who cannot discard
I'd like to test Vivs eventually, but a copy of Big Teferi comes in handy if we can't find our Oketra, especially when we can tick up for card draw and untap lands to use Frilled Mystic for protection
Theyre also a lot less threatening than Korvold and thus much less likely to be the boogeyman at casual tables