Add Fate Unraveler to really go crazy, though at that point we probably have a few too many fours
Elesh Norn's triggered ability will trigger separately for each permanent dealt damage by a source an opponent controls, plus once if you're dealt damage by that source
Voice of Zendikar is one of the safest three mana walkers you can make and so while her effects are often quite low value they will still often dominate a game

Aberrant Aether Channeler Agent of Treachery Alquist Proft, Master Sleuth Architects of Will Armorcraft Judge Azor, the Lawbringer Baleful Strix Barbed Servitor Barrin, Tolarian Archmage Battlewing Mystic Bazaar Trademage Be'lakor, the Dark Master Beastbond Outcaster Bedlam Reveler Biomechan Engineer Blade Juggler Bladecoil Serpent Blood Servitor Bloodcrazed Socialite Bloodtithe Harvester Bonny Pall, Clearcutter Bookwurm Borborygmos and Fblthp Briarbridge Tracker Broodlord Caldaia Strongarm Callous Bloodmage Carnage Interpreter Carven Caryatid Cavalier of Flame Cavalier of Gales Cephalid Sage Champion of Dusk Champion of Wits Charming Scoundrel Chronicler of Heroes Circuit Mender Citanul Woodreaders Clackbridge Troll Clattering Augur Clive, Ifrit's Dominant Clockwork Servant Cloud of Faeries Cloudblazer Cloudkin Seer Combat Thresher Combustible Gearhulk Common Iguana Conciliator's Duelist Coralhelm Chronicler Crackling Drake Crypt Lurker Cultivator Colossus Didact Echo Discerning Peddler Disciple of Bolas Disciple of Freyalise Discourtesy Clerk Doom Weaver Dormant Sliver Drownyard Explorers Dusk Legion Zealot Duskana, the Rage Mother Eagle of Deliverance Earthshaker Dreadmaw Echo Inspector Echo of Death's Wail Elite Guardmage Elite Instructor Elvish Visionary Errand-Rider of Gondor

This set also introduced a powerful cycle of Pokmon-ex with healing and energy acceleration
Heres an archetype I like Heros Downfall in: Creatures (4) Planeswalkers (3) Lands (27) Spells (27) 1 Last Breath 2 Syncopate 2 Doom Blade 2 Ratchet Bomb 4 Azorius Charm 4 Supreme Verdict 2 Detention Sphere 3 Sphinx's Revelation 3 Far 2 Hero's Downfall 2 Dissolve Sideboard Its not clear if adding black is worth the pain (both from shock lands and from Burning Earth), but it is at least worth exploring