The hybrids had cheaper costs that you could play early, often when you might not have drawn both colors of mana, and the traditional gold cards had higher costs, usable at a time when you most likely have drawn both colors
A: Very
Tucking something on ETB is incredibly strong, especially in the blink colors of blue and white, and doing it to each opponent is going to be at least passably good in EDH
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Sacrifice Workhorse with a +1/+1 counter to Ashnod's Altar - make two colorless mana and make a 1/1 Spirit

Red Deck Wins Soul-Scar Mage | Illustration by Steve Argyle (100) Arc Trail Arid Mesa Ash Zealot Barbarian Ring Blazing Rootwalla Bloodfeather Phoenix Bloodstained Mire Bomat Courier Bonecrusher Giant Brute Force Burst Lightning Cemetery Gatekeeper Chain Lightning Dragon's Rage Channeler Dreadhorde Arcanist Earthshaker Khenra Eidolon of the Great Revel Electrostatic Infantry Falkenrath Gorger Falkenrath Pit Fighter Feldon, Ronom Excavator Fiery Islet Figure of Destiny Fire Ambush Fireblast Firebolt Firedrinker Satyr Forked Bolt Galvanic Blast Goblin Guide Grim Lavamancer Harsh Mentor Heartfire Immolator Incendiary Flow Incinerate Infuriate Khenra Spellspear Kumano Faces Kakkazan Lava Dart Lightning Bolt Lightning Strike Maddening Hex Mishra's Factory Monastery Swiftspear Mountain x17 Mox Ruby Mutagenic Growth Mutavault Phoenix Chick Pillar of Flame Play with Fire Price of Progress Prismatic Vista Ragavan, Nimble Pilferer Rakdos Cackler Rampaging Ferocidon Ramunap Ruins Reinforced Ronin Rift Bolt Robber of the Rich Roil Eruption Roiling Vortex Scalding Tarn Seal of Fire Searing Blaze Searing Spear Shatterskull Smashing Shock Skewer the Critics Skullclamp Sokenzan, Crucible of Defiance Soul-Scar Mage Spikefield Hazard Strip Mine Stromkirk Noble Sulfuric Vortex Sunbaked Canyon Tarfire Titan's Strength Volcanic Hammer Wasteland Wild Slash Wooded Foothills Zurgo Bellstriker Good ol Red Deck wins is your typical red aggro deck
