Accomplished Alchemist Animal Attendant Ant-Man's Army Arbor Adherent Armored Scrapgorger Awakened Skyclave Beastcaller Savant Biophagus Birchlore Rangers Birds of Paradise Bugenhagen, Wise Elder Centaur Nurturer Channeler Initiate Citanul Stalwart Dawnhart Rejuvenator Deathbloom Gardener Delighted Halfling Drover of the Mighty Dune Chanter Eccentric Arachnologist Elvish Harbinger Enduring Vitality Esika, God of the Tree Favored Fighter Frog Butler Galadriel, Gift-Giver Gemhide Sliver Gene Pollinator Gilded Goose Glittermonger Great Divide Guide Great Forest Druid Guy in the Chair Hardbristle Bandit Harvester Druid Honored Hierarch Humble Naturalist Ilysian Caryatid Intrepid Paleontologist Ixalli's Lorekeeper Jaspera Sentinel Jewel Thief Jewel-Eyed Cobra Joiner Adept Lifespring Druid Llanowar Envoy Llanowar Loamspeaker Loam Dryad Lotus Cobra Manaweft Sliver Molt Tender Nightshade Dryad Nissa, Resurgent Animist Nomadic Elf Oasis Ritualist Orochi Leafcaller Outcaster Trailblazer Overgrown Zealot Paradise Druid Poison Dart Frog Prize Pig Professional Wrestler Prosperous Innkeeper Quirion Explorer Quirion Sentinel Reclusive Taxidermist Regal Behemoth Rift Sower Rootrider Faun Rosethorn Acolyte Saruli Caretaker

The two rules of thumb to base your instant decisions around are giving your opponent as little information as possible and playing instants in your opponent's end step
They all come from the same source because the share the same flaws
EnergybendingEnergybending allows you to abuse the various cards that care about basic land types, and in Dimir, that is both High TideHigh Tide and about a dozen "cares about Swamps" cards
Lets break down the cards, the mechanics, and how I think this new set is shaping up
These Angels Valkyries have a role as Reapers, and they work alongside the white-aligned Shepherd Valkyries of the plane in a cycle of life and death