Logic Knot

X generic mana one blue mana Instant

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

Counter target spell unless its controller pays X generic mana .

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Showing Future Sight#52

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Logic Knot rulings

2021-03-19
To cast Logic Knot, you choose a value for X, determine the total cost, then pay the total cost with some combination of mana and exiling cards.
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.

Logic Knot keyword rules

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.