Triomes can be found in Ikoria and Streets of New Capenna , and surveil lands appear in Murders at Karlov Manor
If you're thinking of trying out this format, there are quite a few banned cards: Balustrade Spy Bloodstained Mire Expressive Iteration Felidar Guardian Field of the Dead Flooded Strand Geological Appraiser Inverter of Truth Karn, the Great Creator Kethis, the Hidden Hand Leyline of Abundance Lurrus of the Dream-Den Nexus of Fate Oko, Thief of Crowns Once Upon a Time Polluted Delta Teferi, Time Raveler Undercity Informer Underworld Breach Uro, Titan of Nature's Wrath Veil of Summer Walking Ballista Wilderness Reclamation Windswept Heath Winota, Joiner of Forces Wooded Foothills MTG Historic banlist Historic is a digital format for MTG Arena, and is the app's largest constructed format, consisting of both old and new cards
This gives you a free spell to cast from your opponent's deck and that is simply never a bad thing, all while pumping up his loyalty
While its not the most practical way to play, its definitely a fun and unique experience
For example, if Lurrus is your companion, your deck can only include permanents that cost two mana or less
