(2021-09-24) "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." (2021-09-24) You must still follow any timing restrictions and permissions, including those based on the card's type
Angel of the Ruins One of the best artifact removal effects in white, Angel of the Ruins can be a strong two-for-one in EDH, allowing you to exile mana rocks or pesky enchantments
Clockspinning Demonic Collusion Elvish Fury Evangelize Haze of Rage Mystic Speculation Recruit the Worthy Reiterate Spell Burst Sprout Swarm Walk the Aeons Whispers of the Muse Wurmcalling
Fulfil that condition, and youve got an on-demand way to grab opposing creatures
And if you can only have four copies in your deck (a rule I still think should never have applied to Ball Lightning) then you can deal 24 DAMAGE
Serra Angel is nowhere near the power curve of modern day Constructed creatures, but it is objectively a reasonably effective way to end a game youve taken control of