Spy Combo is a green-black ramp deck whose mainboard has no red or blue spells for Hydroblast or Blue Elemental Blast to hit. Thraben Charm's graveyard exile mode could in theory disrupt Dread Return and its flashback, but it is a narrow effect against a deck that tends to win in a single turn, so it is not worth a slot. Dust to Dust needs two artifact targets, and they have very few (Lotus Petal and the occasional Food token from Generous Ent), so it is unreliable here. With no sideboard answers clearly outperforming our maindeck cards, we recommend no changes. This is a pure race: our clock from Myr Enforcer, Moon-Circuit Hacker, and Refurbished Familiar needs to outpace their ramp into Generous Ent and Troll of Khazad-dum. Keep the maindeck as-is and focus on fast starts.