(10/2/2025) "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." (10/2/2025) You must still follow any timing restrictions and permissions, including those based on the card's type
If Llanowar Elves is level zero of the format, then Supreme Verdict is level one
Some examples of where this card shines include Haakon, Stromgald Scourge, Aryel, Knight of Windgrace, Sidar Jabari of Zhalfir, Syr Gwyn, Hero of Ashvale, and many others in commander
Its a bit of a weaker Oblation and a weaker Swords to Plowshares
The triggered ability deals damage to the creatures controller even if the creature isnt dealt damage, perhaps because it has left the battlefield or because the damage was prevented