"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." You must still follow any timing restrictions and permissions, including those based on the card's type
Acererak the Archlich Adeliz, the Cinder Wind Adrix and Nev, Twincasters Aegar, the Freezing Flame Alandra, Sky Dreamer Alania, Divergent Storm Alisaie Leveilleur Alphinaud Leveilleur Ambassador Laquatus Aminatou, Veil Piercer Araumi of the Dead Tide Arcanis the Omnipotent Arjun, the Shifting Flame Ashling, Rimebound Asmoranomardicadaistinaculdacar Azami, Lady of Scrolls Balmor, Battlemage Captain Baral, Chief of Compliance Barrin, Master Wizard Barrin, Tolarian Archmage Black Waltz No
Commander deck-building rules Commander is different amongst Magic formats, as it only allows for one card of each type, except for basic lands
Reuse your ETBs, remove opposing blockers, and blink tokens out of existence
