Oracle

Sorcery 

Exile the top three cards of your library. Until the end of your next turn, you may play those cards. If this spell was cast from a graveyard, you may play cards this way without paying their mana costs.
Flashback 7R (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Tournooi-info

Legal in: Vintage, Legacy, Commander

Officiele rulings

2019-08-23 - wotc
If you don't play some or all of the exiled cards, those cards remain in exile.

2019-08-23 - wotc
Ignite the Future doesn't change when you can play the exiled cards. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty. If you exile a land card, you can play it only during your main phase and only if you have an available land play remaining.

2019-08-23 - wotc
If you cast Ignite the Future from a zone other than a graveyard, you must pay the mana cost or an alternative cost for each spell cast this way. If you cast Ignite the Future from a graveyard, you may choose to cast each spell for its mana cost, an alternative cost, or without paying its mana cost.

2019-08-23 - wotc
If a spell has X in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

2019-08-23 - wotc
If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs and not pay that cost. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Momentous Fall, you must pay those to cast the card.

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