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Tron decks naturally gravitate towards having expensive colorless cards as part of their strategy, which then requires them to ramp up mana to be able to cast them as early as possible
The muted colors, the poster-like work with light, and the terrific drain and gain conceit of the two crystal balls
Still, adding in sweepers (especially cards like Earthquake and Star of Extinction that take advantage of Sevinne, the Chronoclasm's damage-prevention ability) can greatly improve the deck, and there are some interesting ways to cast cards from our graveyard, like Snapcaster Mage, Mission Briefing and Torrential Gearhulk