Rather than use discard people would historically use self mill so that not only would the Ghoul be in the yard but also 20+ power of dorks, perhaps some guaranteed way to recur is involving flashback cards and Narcomoeba
While this card has potential, the fact that many of the best cards are Items and not Supporters limits what it can do

Abominable Treefolk Adarkar Windform Arctic Foxes Arcum's Astrolabe Arcum's Sleigh Arcum's Weathervane Avalanche Avalanche Caller Balduvian Conjurer Balduvian Frostwaker Barbarian Guides Berg Strider Blizzard Blizzard Brawl Blizzard Strix Blood on the Snow Boreal Centaur Boreal Griffin Boreal Outrider Break the Ice Chillerpillar Chilling Shade Cold Snap Conifer Wurm Cover of Winter Dead of Winter Diamond Faerie Draugr Necromancer Drift of the Dead Faceless Haven Freyalise's Radiance Frost Augur Frost Bite Frost Raptor Frostpeak Yeti Frostwalk Bastion Frostwalla Gangrenous Zombies Gargantuan Gorilla Gelid Shackles Glacial Crevasses Glacial Plating Glacial Revelation Glittering Frost Goblin Furrier Goblin Rimerunner Goblin Ski Patrol Graven Lore Grim Draugr Hailstorm Valkyrie Hallowed Ground Heidar, Rimewind Master Ice-Fang Coatl Iceberg Cancrix Icebind Pillar Icebreaker Kraken Icehide Golem Icehide Troll Icequake Into the North Isu the Abominable Jorn, God of Winter Kaldring, the Rimestaff Karplusan Giant Kjeldoran Guard Legions of Lim-Dl Marit Lage's Slumber Melting Moritte of the Frost Mouth of Ronom Narfi, Betrayer King Ohran Yeti

So if we look at rhinos for example, Railway Brawler does get a small discount in cost and is great for double spelling a future turn
Seedborn Muse $8.50 Seedborn Muse is a green staple in Commander, and this card comes from a precon