Tombstalker

six generic mana one black mana Creature — DemonPower and toughness5/5

Flying

Delve (Each card you exile from your graveyard while casting this spell pays for one generic mana .)

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Showing Future Sight#91

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21 printings

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Tombstalker rulings

2021-03-19
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.
2021-03-19
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.
2021-03-19
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.

Tombstalker keyword rules

Flying Rule 702.9

Flying is an evasion ability.

A creature with flying can’t be blocked except by creatures with flying and/or reach. A creature with flying can block a creature with or without flying. (See rule , “Declare Blockers Step,” and rule , “Reach.”)

Multiple instances of flying on the same creature are redundant.

Delve Rule 702.66

Delve is a static ability that functions while the spell with delve is on the stack. “Delve” means “For each generic mana in this spell’s total cost, you may exile a card from your graveyard rather than pay that mana.”

The delve ability isn’t an additional or alternative cost and applies only after the total cost of the spell with delve is determined.

Multiple instances of delve on the same spell are redundant.