Toward the end of the game, make full use of the security-card-trashing When Attacking effects to quickly give you the edge
Here's another card with a big shot at being in Magic's World Champion's deck next Sunday, so there's not telling how much it could cost by Monday

Metagame Breakdown 146 ABC (143 ABC, 1 Artifact ABC, 1 Brilliant ABC, 1 Symphonic Warrior ABC) 118 Metalfoes (117 Metalfoes, 1 Speedroid Metalfoes) 84 D/D 69 Blue-Eyes (67 Blue-Eyes, 2 Ritual Blue-Eyes) 23 HERO (22 HERO, 1 Synchro HERO) 21 Darklord (19 Darklord, 1 Speedroid Darklord, 1 Speedroid Burning Abyss Darklord) 15 DARK Synchro 14 Burning Abyss (11 Speedroid Phantom Knights Burning Abyss, 1 Ritual Burning Abyss, 1 Speedroid Burning Abyss, 1 Speedroid Nekroz Burning Abyss) 10 Frog (7 Speedroid Frog, 2 Frog, 1 Frog Paleozoic) 9 Monarch (3 Brilliant Monarch, 3 Domain Monarch, 2 Speedroid Artifact Monarch, 1 Artifact Brilliant Monarch) 6 Yang Zing (4 Speedroid Yang Zing, 2 Metalfoes Yang Zing) 5 Kozmo (4 Kozmo, 1 Speedroid Kozmo) 3 Infernoid 3 Nekroz (2 Shaddoll Nekroz, 1 Nekroz) 3 Qliphort 3 Yosenju 2 Cyber Angel 2 Junk Doppel 2 Lightsworn (1 Lightsworn, 1 Shiranui Lightsworn) 1 Barrier Statue 1 Dark Magician 1 Denglong FTK 1 Galaxy 1 Lightsworn Shiranui 1 Ritual Beast 1 Speedroid Phantom Knights 1 Tellarknight ABC The early ABC builds were running Galaxy Soldier and Transmodify

That said, there are some strategies that can synergize with Sarkhans Ultimate
Try to draft for strong instants like Burn the Accursed that make it easy to pass from Day to Night without losing a full turn of mana