Oracle

Sorcery 

Delve (Each card you exile from your graveyard while casting this spell pays for 1.)
Each opponent discards two cards.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

11/24/2014
You exile cards from your graveyard at the same time you pay the spell’s cost. Exiling a card this way is simply another way to pay that cost.

11/24/2014
Delve doesn’t change a spell’s mana cost or converted mana cost. For example, the converted mana cost of Tasigur’s Cruelty (with mana cost 5B) is 6 even if you exile three cards to cast it.

11/24/2014
You can’t exile cards to pay for the colored mana requirements of a spell with delve.

11/24/2014
You can’t exile more cards than the generic mana requirement of a spell with delve. For example, you can’t exile more than five cards from your graveyard to cast Tasigur’s Cruelty.

11/24/2014
Because delve isn’t an alternative cost, it can be used in conjunction with alternative costs.

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