Then exile it.) "Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell 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
We do this as gamers who want certain cards for as cheap as possible while maximizing the value were getting
Sometimes they end with Donate and Illusions of Grandeur, other times they use other methods
Vanquish the Horde gets less expensive with every creature on the table, to the point where it's often a two-mana board sweeper in multiplayer Commander games
Havoc Festival If nothing else, Rakdos is a very egalitarian color pair: Everyone must suffer equally
I wanted to include Sublime Epiphany here as a representative of that draft format, but also as my favourite card combo to try for when drafting the set