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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

Whenever Eluge enters or attacks, put a flood counter on target land

But aggressive decks can get similar team buffs from creatures that can attack, and Assault Formation defender decks dont want power bonuses

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

In the end I chose to do the latter

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