However, the binder method is a bit limiting if you have six or more copies of any single card
Akroan Horse Armored Warhorse Bill the Pony Black Carriage Breaching Hippocamp Brightfield Mustang Bronze Horse Calamity, Galloping Inferno Carnival Hellsteed Caustic Bronco Chrome Steed Clockwork Steed Cobbled Lancer Colorstorm Stallion Cosmos Charger Crested Sunmare Diamond Mare Dusk Charger Dwarven Pony Excava, the Risen Past Fleshmad Steed Ghoulsteed Gilded Ghoda Guardian Sunmare Hipparion Keleth, Sunmane Familiar Lightning Mare Loch Mare Motivated Pony Nightmare Ordinary Pony Ostrich-Horse Phantasmal Mount Phantom Steed Phyrexian Warhorse Plague Mare Rearing Embermare Sacred Prey Shadowfax, Lord of Horses Shield Mare Stallion of Ashmouth Surge Mare Tarpan Temur Charger Thundering Mightmare Thundermare Timbermare Trenching Steed Underworld Charger Vine Mare Wandermare Wavebreak Hippocamp Workhorse Zodiac Horse
If you don't care about the echo you play Last Gasp or Grasp of Darkness or an actually good card
Intrigued about which those may be
UB can play off the same strong commons and uncommons as UR does, and it has some great expensive spells to pair them with like Sephiroth's Intervention, Ice Magic, Dreams of Laguna (flashback), and Sidequest: Hunt the Mark