For this list in particular the Jar is very poor as in order to use it right away you have to have spent five mana
The idea is to play Archfiend and then play Metamorphic Alteration on an opponent's creature to turn it into an Archfiend of the Dross
Agent of the Shadow Thieves Altar of Shadows Archpriest of Shadows Armor of Shadows Ashcoat of the Shadow Swarm Ashcoat of the Shadow Swarm Author of Shadows Circle of Protection: Shadow City of Shadows Dakkon, Shadow Slayer Dance of Shadows Davriel's Shadowfugue Davriel, Rogue Shadowmage Death's Shadow Devour in Shadow Dokuchi Shadow-Walker Dovin's Veto Dragon Shadow Duskmantle, House of Shadow Elves of Deep Shadow Embrose, Dean of Shadow Eventide's Shadow Falthis, Shadowcat Familiar Feral Shadow Fiend of the Shadows Flameshadow Conjuring Foreshadow Gix, Yawgmoth Praetor Grasping Shadows Horrid Shadowspinner Interceptor, Shadow's Hound Kagha, Shadow Archdruid Kaito, Dancing Shadow Kami of Restless Shadows Kiku's Shadow Knight of Dusk's Shadow Mardu Shadowspear Maze of Shadows Misery's Shadow Moonshadow Nether Shadow Nezumi Shadow-Watcher Nissa of Shadowed Boughs Oko, Shadowmoor Scion Perilous Shadow Reach of Shadows Ronin, Shadow Stalker Shadow Alley Denizen Shadow Glider Shadow Guildmage Shadow Kin Shadow Lance Shadow Prophecy Shadow Puppeteers Shadow Rider Shadow Rift Shadow Slice Shadow Sliver Shadow Stinger Shadow Summoning Shadow Urchin Shadow in the Warp Shadow of Doubt Shadow of Mortality Shadow of the Enemy Shadow of the Goblin Shadow of the Grave Shadow of the Second Sun Shadow, Mysterious Assassin Shadow-Rite Priest Shadowbane Shadowbeast Sighting
Similar pull structure, similar appeal the choice between Black Bolt and White Flare typically comes down to Zekrom vs
