Caw Gates leans on Journey to Nowhere and Thraben Charm as its removal suite alongside Prismatic Strands to fog through combat damage, so Mask of Law and Grace protects your best threat from Journey to Nowhere entirely since it only grants protection from black and red, not white — actually reconsider, note Journey to Nowhere and Thraben Charm are white, so Mask does not stop them; it mainly helps against nothing relevant here, but it does block colorless/red damage sources incidentally. Faerie Macabre is still valuable as a flying blocker against their ground-based Sacred Cat and Outlaw Medic while disrupting any Pursue the Past flashback plans. Board out your own Journey to Nowhere since it's a clunky 2-mana answer in a low-impact aggro mirror where you want to be proactive, and keep Cartouche count reduced slightly since their Prismatic Strands can blank a first-strike alpha strike for a turn. Focus the plan on curving out hexproof threats faster than their gate-based mana engine can support removal.