A control deck counters spells as they're being cast and removes and problem creatures that hit the battlefield
As a result, the deck was not only faster but more consistent, thanks to the ability to get twice as many cards in the graveyard

Take a look at the entire Commander deck below: Creatures (31) 1 Solemn Simulacrum 1 Duplicant 1 Artisan of Kozilek 1 It That Betrays 1 Steel Hellkite 1 Palladium Myr 1 Burnished Hart 1 Soul of New Phyrexia 1 Hangarback Walker 1 Oblivion Sower 1 Endless One 1 Bane of Bala Ged 1 Kozilek, the Great Distortion 1 Endbringer 1 Matter Reshaper 1 Metalwork Colossus 1 Meteor Golem 1 Suspicious Bookcase 1 Geode Golem 1 Ancient Stone Idol 1 Scaretiller 1 Stonecoil Serpent 1 Crashing Drawbridge 1 Myriad Construct 1 Phyrexian Triniform 1 Ornithopter of Paradise 1 Zhulodok, Void Gorger 1 Omarthis, Ghostfire Initiate 1 Abstruse Archaic 1 Skittering Cicada 1 Flayer of Loyalties Planeswalkers (1) Lands (38) 1 Temple of the False God 1 Urza's Tower 1 Urza's Power Plant 1 Urza's Mine 1 Reliquary Tower 1 Eldrazi Temple 1 Rogue's Passage 1 Tomb of the Spirit Dragon 1 Arcane Lighthouse 1 Mage-Ring Network 1 Shrine of the Forsaken Gods 15 Wastes 1 Mirrorpool 1 Ruins of Oran-Rief 1 Sea Gate Wreckage 1 Geier Reach Sanitarium 1 Scavenger Grounds 1 Arch of Orazca 1 Forge of Heroes 1 Blast Zone 1 Bonders' Enclave 1 War Room 1 Guildless Commons 1 Tyrite Sanctum Spells (30) 1 Sol Ring 1 Lightning Greaves 1 Fireshrieker 1 Mind Stone 1 Worn Powerstone 1 Thran Dynamo 1 Everflowing Chalice 1 All Is Dust 1 Dreamstone Hedron 1 Not of This World 1 Perilous Vault 1 Unstable Obelisk 1 Hedron Archive 1 Titan's Presence 1 Thought Vessel 1 Spatial Contortion 1 Warping Wail 1 Mirage Mirror 1 Transmogrifying Wand 1 Endless Atlas 1 Mystic Forge 1 Mazemind Tome 1 Forsaken Monument 1 Kaldra Compleat 1 Investigator's Journal 1 Calamity of the Titans 1 Desecrate Reality 1 Rise of the Eldrazi 1 Ugin's Mastery 1 Darksteel Monolith What do you think of the Eldrazi Unbound deck

Young Pyromancer is sometimes considered a peer of Tarmogoyf, Snapcaster Mage and other powerful two-drop creatures, generating many Elemental tokens in spell-heavy decks (such as Delver of Secrets builds and Mardu builds)
This is true even if the spell is an instant
While Trostani and Armada Wurm and friends represent an extremely potent late game, they can still get trumped by Angel of Serenity or Craterhoof Behemoth before they can end the game