The bounce land's Retreat to Coralhelm's You'll want to put the bounce land trigger on the stack first, then Retreat's trigger
The Brothers War in Context The Brothers War is the most powerful Standard-legal set we have seen in quite some time

The Dungeons Baldur's Gate Wilderness Dungeon of the Mad Mage Lost Mine of Phandelver Tomb of Annihilation Undercity Venture Cards Acererak the Archlich Bar the Gate Clattering Skeletons Delver's Torch Displacer Beast Dungeon Descent Dungeon Map Eccentric Apprentice Ellywick Tumblestrum Fates' Reversal Fifty Feet of Rope Find the Path Fly Immovable Rod Intrepid Outlander Keen-Eared Sentry Kick in the Door Midnight Pathlighter Nadaar, Selfless Paladin Planar Ally Precipitous Drop Radiant Solar Ranger's Hawk Secret Door Sefris of the Hidden Ways Shortcut Seeker Thorough Investigation Triumphant Adventurer Varis, Silverymoon Ranger Veteran Dungeoneer Wandering Troubadour You Find a Cursed Idol Yuan-Ti Fang-Blade Yuan-Ti Malison Zalto, Fire Giant Duke Zombie Ogre Payoff Cards Acererak the Archlich Barrowin of Clan Undurr Cloister Gargoyle Eccentric Apprentice Ellywick Tumblestrum Gloom Stalker Nadaar, Selfless Paladin Precipitous Drop We should also probably mention Dungeon Delver and Hama Pashar, Ruin Seeker

Usually, its printed on some big Eldrazi that needs to attack, and even then you usually only get one or two sacrifices off it
If your cards are frozen in the binder, carefully cut the rows out