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Unfortunately, this doesn't apply to DEF, so leaving Dragon Master in attack position may provide a better defense

The Fang of Critias The Fang of Critias Send 1 Trap from your hand or field to the GY, that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck

This is accomplished with artifacts like Illusionist's Bracers and Magewright's Stone which let you re-trigger Marrow-Gnawer

Then theres Strip Mine because I own a fancy expedition version and I wanted to play it somewhere, and this deck has wiggle room for a few colorless utility lands