Delve doesn't change a spell's mana cost or mana value. For example, Treasure Cruise's mana value is 8 even if you exiled three cards to cast it.
19-03-2021
wotc
You can exile cards to pay only for generic mana, and you can't exile more cards than the generic mana requirement of a spell with delve. For example, you can't exile more than seven cards from your graveyard to cast Treasure Cruise unless an effect has increased its cost.
19-03-2021
wotc
Because delve isn't an alternative cost, it can be used in conjunction with alternative costs, such as flashback. It can also be used to pay for additional costs that include generic mana.
20-09-2014
wotc
Dead Drop doesn't target any creature. The target player could sacrifice a creature with hexproof, for example.
20-09-2014
wotc
The target player chooses which creatures they will sacrifice as Dead Drop resolves. If the player controls only one creature at that time, they will sacrifice it.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.