Their first ability is only on enters, and that second ability, while cool, requires setup
Edric decks use flying creatures because they're hard to block and get through usually
Raw near-mint 1st Edition copies trade around $375 to $450, which sounds reasonable until you see the graded ceiling: a PSA 10 sold for $63,000 in March

Ramp: Sakura-Tribe Elder, Rampant Growth, Farseek, Nature's Lore, Kodama's Reach, Explosive Vegetation, Skyshroud Claim, Tempt with Discovery, Urza's Incubator, Sword of Feast and Famine Card Advantage: Puresteel Paladin, Sram, Senior Edificer, Stone Haven Outfitter, Mask of Memory, Sword of Fire and Ice, Rishkar's Expertise, Hunter's Insight, Life's Legacy, Greater Good, Lifecrafter's Bestiary, Sylvan Library Protection: Heroic Intervention, Champion's Helm, Nim Deathmantle, Conqueror's Flail, Teferi's Protection, Indomitable Archangel, Leonin Abunas Disruption: Dispatch, Aura Shards, Scavenging Ooze, Swords to Plowshares, Dromoka's Command, Beast Within, Return to Dust, Wrath of God, Day of Judgment, Phyrexian Reclamation, Fumigate, Austere Command, Rest in Peace, Relic of Progenitus, Nature's Claim, Sylvan Reclamation Recursion: Sword of Light and Shadow, Nahiri, the Lithomancer, Buried Ruin
Activate only as a sorcery, and [Cost]: Unattach this permanent