Id probably play Lion Sash if given the choice, but you feel good with any of these

1 Stella Lee, Wild Card 1 Eris, Roar of the Storm 1 Archmage Emeritus 1 Baral's Expertise 1 Tezzeret's Gambit 1 Midnight Clock 1 Haughty Djinn 1 Dig Through Time 1 Winged Boots 1 Talrand, Sky Summoner 1 Octavia, Living Thesis 1 Thunderclap Drake 1 Lock and Load 1 Forger's Foundry 1 Finale of Revelation 1 Curse of the Swine 1 Mizzix's Mastery 1 Chaos Warp 1 Crackling Spellslinger 1 Pyretic Charge 1 Smoldering Stagecoach 1 Elemental Eruption 1 Rousing Refrain 1 Cursed Mirror 1 Bloodthirsty Adversary 1 Finale of Promise 1 Arcane Bombardment 1 Niv-Mizzet, Parun 1 Kaza, Roil Chaser 1 Shark Typhoon 1 Galvanic Iteration 1 Epic Experiment 1 Veyran, Voice of Duality 1 Leyline Dowser 1 Exotic Orchard 1 Shivan Reef 1 Sulfur Falls 1 Frostboil Snarl 1 Temple of Epiphany 1 Cascade Bluffs 1 Ferrous Lake 1 Treasure Cruise 1 Preordain 1 Ponder 1 Murmuring Mystic 1 Deep Analysis 1 Radical Idea 1 Opt 1 Think Twice 1 Arcane Denial 1 Pteramander 1 Vandalblast 1 Pongify 1 Serum Visions 1 Faithless Looting 1 Big Score 1 Storm-Kiln Artist 1 Young Pyromancer 1 Electrostatic Field 1 Guttersnipe 1 Volcanic Torrent 1 Windfall 1 Goblin Electromancer 1 Third Path Iconoclast 1 Expressive Iteration 1 Arcane Signet 1 Izzet Signet 1 Sol Ring 1 Command Tower 1 Temple of the False God 1 Reliquary Tower 1 Izzet Boilerworks 1 Propaganda 14 Island 13 Mountain Quick Draw tokens 1 Bird Illusion // Elemental token 1 Ape // Shark token 1 Drake // Soldier (Urzan) token 1 Boar // Drake token 1 Elemental // Soldier (Urzan) token 1 Dragon Elemental // Bird Illusion token 1 Dragon Elemental // Treasure token 1 Bounty: Rissa "Blades" Lee // Bounty Rules token 1 Bounty: Sleepy Sovka // Bounty Rules token 1 Bounty: Miron Tillas Jr

The most recently added text box wins if there is a contradiction
To pay 4 mana and then the mana cost of whatever spells I want to flashback, most of the time I'd be able to recur one spell, maybe two, and forget about casting it for its own flashback cost
You can also choose to make your deck list public, that way others can view it
While were not trilled to do this, we can also use the Divider to remove counters from our planeswalker: Karn, the Great Creator