I dont think theres a huge need to cast Radiant Flames out of the sideboard for three so Im not playing a third color of mana, but if there is a good reason, you could get by shaving a Forest for a Canopy Vista which is fetchable by all of the lands
Kaervek the Merciless Stax decks are all about punishing or preventing your opponents for playing the game, with Kaervek the Merciless serving as a marquee example of the punishment angle
If you have any questions welcome to contact us on eBay anytime

Hans, Run!" Alpine Houndmaster Angel's Herald Archmage Ascension Asmoranomardicadaistinaculdacar Assembly Hall Avarax Ayara's Oathsworn Behemoth's Herald Behold My Grandeur Beseech the Mirror Beseech the Queen Bogbrew Witch Brainspoil Bringer of the Black Dawn Case of the Stashed Skeleton Clarion Ultimatum Clutch of the Undercity Cool but Rude Coveted Prize Cruel Tutor Cynical Loner Dark Petition Daru Cavalier Demon's Herald Demonic Bargain Demonic Collusion Demonic Tutor Diabolic Intent Diabolic Intent Diabolic Tutor Dimir House Guard Dimir Infiltrator Dimir Machinations Disciple of Deceit Distant Memories Dizzy Spell Dragon's Herald Dragonstorm Forecaster Drift of Phantasms Elvish Clancaller Embermage Goblin Emeritus of Woe Entomb Ethereal Usher Everythingamajig Forging the Tyrite Sword Gamble Gigantiform Gravebreaker Lamia Grim Servant Grim Tutor Growth-Chamber Guardian Grozoth Hoarding Broodlord Hour of Victory Illicit Shipment Imperial Seal Increasing Ambition Infectious Bloodlust Infernal Tutor Insatiable Avarice Johnny, Combo Player Kyscu Drake Lagomos, Hand of Hatred Library of Lat-Nam Liliana Vess Lively Dirge Llanowar Sentinel Long-Term Plans Magitek Infantry Mask of the Mimic

Mostly I just like the way that protection from instants and sorceries plays much better than protection from colors, offering more dynamic gameplay by allowing the opponent to block if theyre so inclined