Paying in installments is just another form of efficiency, and gives you some amount of flexibility but also some amount of political clout at the table
Duplicate protection still exists, so reprints of rare and mythic rare cards that you've already collected will still be deferred until you've collected all the other eligible cards of that rarity in the set
If you can get something on the stack and then follow up with an Eldrazi spell, perhaps an instant or something with flash, you can actually end up copying non-Eldrazi spells once Ulalek's ability resolves
Aang, A Lot to Learn Advent of the Wurm Aerith, Last Ancient Ahn-Crop Champion Ajani Unyielding Ajani's Aid Ajani, Mentor of Heroes Ajani, Sleeper Agent Ajani, Valiant Protector Ajani, the Greathearted Alenni, Brood Recruiter Alert Heedbonder Alessos and Pras, Acrobats Almost Perfect Altar of Bone Ancient Spider Anthem of Champions Anurid Brushhopper Aragorn and Arwen, Wed Aragorn, Company Leader Arahbo, Roar of the World Arashin Sovereign Archon of Valor's Reach Arcus Acolyte Armada Wurm Armadillo Cloak Arming Gala Armored Wolf-Rider Arwen, Mortal Queen Asmira, Holy Avenger Assure // Assemble Assure // Assemble Atzocan Seer Aura Mutation Aura Shards Autochthon Wurm Banquet Guests Barkshell Blessing Baseball Bat Bast, Panther Goddess Battle for Bretagard Begin Anew Behemoth Sledge Belligerent Brontodon Bess, Soul Nourisher Better Than One Black Panther, Vanguard Black Panther, Wakandan King Bloomwielder Dryads Botanical Brawler Brightglass Gearhulk Brigid's Command Bronzebeak Moa Bronzehide Lion Buried in the Garden Burnished Dunestomper Burrowguard Mentor Butterbur, Bree Innkeeper Byrke, Long Ear of the Law Cadira, Caller of the Small Calix, Destiny's Hand Calix, Guided by Fate Call of the Conclave Camaraderie Captain Sisay Captain Sisay Captured Sunlight Captured by Lagacs Caradora, Heart of Alacria Catti-brie of Mithral Hall Cease // Desist Centaur Healer
