I'll only discuss cards that inherently have flash, ignoring those that grant the keyword to other cards
Nashi, Moon Sages Scion Nashi, Moon Sage's Scion has no place in the command zone
Your job is to time removal so your opponent can't get that dual utility out of their spells, and you do this by passing priority
Bot Aang, Air Nomad Abomination of Llanowar Abu Ja'far Abyssal Nocturnus Abyssal Specter Academy Raider Access Tunnel Accursed Spirit Achilles Davenport Adrestia Aegis Angel Aeronaut Tinkerer Aether Tunnel Agent of Horizons Agents of HYDRA Agility Bobblehead Air Elemental Air Servant Akawalli, the Seething Tower Akroan Line Breaker Alley Strangler Alora, Merry Thief Alpha Authority Amphin Pathmage Amrou Kithkin Amrou Seekers Anaconda Angel of Mercy Angelic Blessing Angelic Guardian Angelic Intervention Angelic Page Animus of Night's Reach Ant-Man's Air Force Ant-Man, Elusive Avenger Ant-Man, Reformed Rogue Antique Collector Anurid Murkdiver Aphotic Wisps Apocalypse Runner Apostle of Purifying Light Appa, Aang's Companion April O'Neil, Kunoichi Trainee Aquatic Incursion Aqueous Form Aradara Express Arcbound Fiend Archon of Absolution Arctic Foxes Argothian Pixies Argothian Sprite Arlinn's Wolf Armed Assailant Armory Veteran Arnim Zola, Bio-Fanatic Aron, Benalia's Ruin Artful Dodge Artifact Ward Ascendant Evincar Ashiok's Skulker Aspiring Aeronaut Assassin Den Atarka Pummeler Atomic Microsizer Audacious Infiltrator Avatar Kuruk Avatar of Hope Avatar of Woe Aven Battle Priest Aven Cloudchaser Aven Fisher
Hed fit in brilliantly and gains Lore faster than youd expect
Oh, and the reprints aren't too shabby either, at least as far as the different treatment cards go
