Living End wants to suspend and cascade its titular sorcery cheaply, and Vexing Bauble can counter their free-cast Endurance or Force of Negation since those are cast for zero mana via evoke or their alternative casting cost. Six provides a resilient body and mills, which is low-risk since Living End cares about creature cards in graveyard for their own combo, not ours. Skyline Cascade can slow down one of their post-combo attackers for a turn. We avoid boarding in Dismember here since their real threats come from the Living End sorcery itself rather than easily-killed small creatures, and trim marginal value pieces to make room.