Oracle

Instant 

Delve (Each card you exile from your graveyard while casting this spell pays for 1.)
Return target nonland permanent you control and target nonland permanent you don't control to their owners' hands.

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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