Its monocolor, instant speed, gets you back any previously-milled threat, and has some pretty significant interactions with other powerful spells including the number one self-mill effect on our list 1
Rulings 2024-11-08 "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." 2024-11-08 A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way
Also, the equipped creature gets +2/+2, and whenever it deals combat damage to a player, surveil two, and you may cast an instant or sorcery card from your graveyard with a mana value of two or less without paying its mana cost
Even if Takenuma was a relatively bad mill spell, the fact you can play the first copy over a basic Swamp at almost no penalty to your manabase would get it into tons of lists
For Azurite Sea theyve gone with 12 Rescue Rangers Away
Which is your favorite proliferate commander