Eldrazi Ramp is a big-mana deck that aims to deploy Emrakul, the Promised End or Ugin, Eye of the Storms before you can assemble your combo, and their Trinisphere and Chalice of the Void from the sideboard are the primary threats to your gameplan. Orim's Chant on their upkeep prevents them from tapping mana for their key lock pieces or large threats, effectively buying you the turn you need to go off. Prismatic Ending cleanly handles a resolved Trinisphere (at cost three with three colors) or Chalice of the Void, which is your main way to answer their post-board disruption. Their Vexing Bauble can interfere with your combo sequence by drawing them a card and presenting a speed bump, but it doesn't stop your ritual chains and is manageable. Mulligan aggressively toward fast hands since their Kozilek's Command can also disrupt your artifacts — a turn-three kill is reliably safe as they typically need multiple land drops. Elegant Parlor and Artist's Talent are cut as too incremental against a deck racing for large game-ending threats.