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The last ability granted by Nazgl Battle-Mace will trigger

When you spend this mana to cast an instant or sorcery spell with mana value 3 or less, you may exile that spell instead of putting it into its owner's graveyard as it resolves

Mondrak, Glory Dominus is one of the best cards around for multiplying tokens, making the decks token-based attack even more potent

Or, if you want to save money, you can repurpose small boxes or stands you already have at home, maybe from a leftover kitchen organizer or a thrift store find

There aren't many colorless legendary spells you'll be casting anyway, and in this decklist, the only colorless legendary spells are artifacts, which aren't too costly to cast to begin with

Decks like Raging Bolt and Gholdengo can make use of this card to get energy back to set up for attacks on the following turn, which helps them maintain consistency after their board is broken