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This can create infinite combos with 0-mana cards, such as some of the most valuable or rarest Magic: The Gathering cards, like Mox Diamond

Jarsyl, Dark Age Scion

Wow, he actually used different attributes

It also negates targeted removal and even some mass removal like All is Dust

"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