I was pretty excited to get to preview the reprint of Dungeon Geists, as I really love the card, and if Standard looked a bit different, its easy to imagine the card being excellent out of the sideboard of Mono-Blue
Druids and merfolk are a very restrictive pair of creature types, but it makes sense when you have such a powerful recursive ability in retrace
I never even attempted Extreme in Deep Trouble, but I can see myself working up to it in Palace Heist, especially now that I have a nice organized box to keep everything in
Im a big fan of a cards theme and lore really closely matching what the card actually does

Black Dragon Gate Brave the Elements Caged Sun Call to Arms Chameleon Spirit Charm School Cho-Manno's Blessing Chromatic Armor Circle of Affliction Citadel Gate Clara Oswald Cliffgate Coldsteel Heart Corrupted Grafstone Crosis, the Purger Crossroads Village Curse of Wizardry Darigaaz, the Igniter Diamond Knight Diamond Mare Dromar, the Banisher Edgewall Inn Faceless One Flickering Ward Floating Shield Forsaken Crossroads Gauntlet of Power Glory Hall of Triumph Harsh Judgment Heraldic Banner Hotel of Fears Iona, Shield of Emeria Jeweled Torque Jihad Kabira Evangel Lurebound Scarecrow Manor Gate Meteor Crater Mirage Mesa Night Market Nykthos, Shrine to Nyx Nyx Nyx Lotus Oona, Queen of the Fae Order of the Stars Painter's Servant Paradise Plume Pentarch Paladin Pentarch Ward Persecute Prism Ring Prismatic Boon Prismatic Circle Prismatic Ward Psychic Allergy Puca's Eye Quirion Elves Radiant Lotus Reverent Mantra Rhystic Cave Riptide Replicator Rith, the Awakener Sanctuary Blade