“This Colorless Prison/Ramp deck uses fast mana from Ancient Tomb and Grim Monolith to deploy early lock pieces like Trinisphere, while Karn, the Great Creator tutors silver bullets from the sideboard and The One Ring provides card advantage and protection. Urza's Saga assembles key artifacts and finds Candelabra of Tawnos to untap Urza's Tron lands, enabling explosive mana to deploy game-ending threats like Emrakul, the Aeons Torn or Ugin, Eye of the Storms. The deck wins by either locking the opponent out of the game entirely or overwhelming them with uncounterable, reality-warping threats that are impossible to answer through the established prison pieces.”
Missing sideboard cards? The full 15-card sideboard runs about $345.
Buy sideboard on ManapoolDimir Tempo leans on Murktide Regent and a transformed Tamiyo as its win conditions, backed by Force of Will and Daze; extra copies of Force of Negation help us fight through their countermagic to land our own threats. Karakas can bounce a problematic Bilbo, Thief in the Night or other legendary threat, buying time. Portent of Calamity and Thundertrap Trainer are cut since they're too slow against a deck that wants to tempo us out and pressure our life total. Protect Ugin, Eye of the Storms and The One Ring since they out-value their disruption-based gameplan over a long game.
Both decks are Eldrazi-colorless mirrors relying on Chalice of the Void and big colorless threats; Faerie Macabre and Tormod's Crypt disrupt their Kozilek's Command graveyard exile mode and any delve/recursion plans while being nearly free. Portent of Calamity and Thundertrap Trainer are clunky against a deck full of efficient Chalice-protected threats and get cut for cheap graveyard disruption. Keep Force of Negation and Force of Will in as they're vital versus their Chalice of the Void and Kozilek's Command. This is a battle of who assembles their engine (Ugin, Karn, The One Ring) faster, so keep the core intact.
Ocelot Pride wants to flood the board with a wide army of small Cat tokens, so Ensnaring Bridge is excellent once you empty your hand, effectively locking out their attacks. Karakas gives you repeatable answers to Ajani, Nacatl Pariah by bouncing the legendary creature form before it flips or resetting Thalia, Guardian of Thraben. Dismember cheaply answers Guide of Souls, Amped Raptor, or an early Ocelot Pride itself, slowing the life-gain and token engine before it snowballs. Force of Negation is weaker here since much of their pressure comes from creatures and activated/triggered abilities it cannot stop, so trimming to zero frees slots for more proactive answers while keeping Force of Will for their few key noncreature spells like Static Prison.