Eldrazi Tron brings Chalice of the Void and Trinisphere to lock out your cheap spells, plus its own colorless removal suite (Dismember, Kozilek's Command), so cheap efficient interaction and enchantment/artifact hate are premium here. Nature's Claim is your best answer to Chalice of the Void and Trinisphere before they lock your hand, gaining tempo back at instant speed for a single green mana. Warping Wail gives you flexible interaction that dodges their own Chalice/Trinisphere lock since it's colorless at {1}{C} but still costs 2, so sequence it before they land a Chalice on 1 or 2. Grafdigger's Cage disrupts their Emrakul, the Promised End and Ulamog, the Ceaseless Hunger recursion plans if they get exiled and returned via any graveyard shenanigans, and generally taxes their limited card advantage engines. Unholy Heat and Writhing Chrysalis are far too slow or simply outclassed against a deck with almost no small creatures to profitably target, so they come out for higher-impact disruption.