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"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

As many players have pointed out on social media, the card gives Boros the potential for explosive wins early in the game

You can only use this effect of "Eidos the Underworld Squire" once per turn

Or if you are me, you can summon it, then realize Luna is your only creature and she's currently shrouded by Lightning Greaves which you can't move off of her, so your grand plan immediately dies and everything is terrible