Selesnya Company's game plan revolves around cheap value creatures like Prosperous Innkeeper, Heliod, Sun-Crowned, and Collected Company hits, most of which are mana value 3 or less and vulnerable to Abrupt Decay, which also can't be countered by their Dovin's Veto-less maindeck. Thoughtseize proactively strips Collected Company or Heliod, Sun-Crowned before they can anchor their lifegain synergies. Voldaren Epicure's 1 damage ping does little against their lifegain-heavy plan since they'll regularly outpace small amounts of damage, and extra Torch the Tower is replaced since many of their threats (Heliod at 5 toughness, Voice of the Blessed scaling up) dodge it easily.