<tswett> learn Delve is a static ability that functions while the spell with delve is on the stack. \xe2\x80\x9cDelve\xe2\x80\x9d means \xe2\x80\x9cFor each generic mana in this spell\xe2\x80\x99s total cost, you may exile a card from your graveyard rather than pay that mana.\xe2\x80\x9d The delve ability isn\xe2\x80\x99t an additional or alternative cost and applies only after the total cost of the spell with delve is determined.

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.