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Niv-Mizzet, Supreme
Flying, hexproof from monocolored Each instant and sorcery card in your graveyard that's exactly two colors has jump-start. (You may cast that card from your graveyard by discarding a card in addition to paying its other costs. Then exile it.)
Rulings (4)
May 12, 2023 · You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using jump-start only when you could normally cast a sorcery.
May 12, 2023 · If an effect allows you to pay an alternative cost rather than a spell's mana cost, you may pay that alternative cost when you jump-start a spell. You'll still discard a card as an additional cost to cast it.
May 12, 2023 · If an instant or sorcery card is put into your graveyard during your turn, you'll be able to cast it right away if it's legal to do so, before any player may attempt to remove that card from your graveyard.
May 12, 2023 · A spell cast using jump-start will always be exiled afterward, whether it resolves, it's countered, or it leaves the stack in some other way.