sultai red ramp (Standard)

Ramp

Rattleclaw Mystic: fix the mana and when morphed gives 2 more instead
Whisperer of the Wilds: nice early blocker and with a fattie on the field gives you 1 more mana
Shaman of Forgotten Ways: gives you 2 mana with fix for creatures and in late can go for the win with his formidable if have some evasive creature or more than the opponent
Explosive Vegetation: gives 2 lands with possibility of mana fixing if missing a color

Utility

Temur Ascendancy: gives haste to all creatures and draws you card with almost everyone
Negate and Spell Shrivel: to protect creatures from removal/mass removal and counters, spell shrivel can stop problematic creatures too
Kiora, Master of the Depths: help ramp/defend with +1, search for hitters with -2 and his ult is a "continous" removal
Conduit of Ruin: fattie tha let you pay less your creature and search for one of you bigger guys
Villainous Wealth: the more mana you spend the more cards you can play/mill from you opponents deck
Deathbringer Regent: as mass removal that leaves a good dragon behind, with a friend if there's Ulamog on the battlefield
Kheru Lich Lord: gives all of your creatures a second chance

Fatties

Necromaster Dragon: deal damage while putting zombies, and as a plus mill cards from opponents deck
Reality Smasher: with his ability force the opponent to do a 2x1 to take him out, and if you have a counter you can easily do a 2x1 against him and still have this good guy
Ulamog, the Ceaseless Hunger: well, we all know this, if not removed wins the game alone

Sideboard

Plummet: against annoying flyers
Naturalize: mostly for enchantments
Sire of stagnation: is a great help against landfall decks
Radiant Flames: against aggro
Psychic Rebuttal: in place of Negate against cards like Crater's Claws, Kolaghan's Command, Foul-Tongue Invocation, Celestial Flare
Tainted Remedy: with the likes of aristocrats