Like most Magic: The Gathering cards, the value of Bitterthorn, Nissa's Animus depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Secrets of Strixhaven Commander)

Arid Mesa Axgard Armory Bad River Bant Panorama Blighted Woodland Bloodstained Mire Bountiful Landscape Brokers Hideout Cabaretti Courtyard Contaminated Landscape Deceptive Landscape Demolition Field Escape Tunnel Esper Panorama Evolving Wilds Fabled Passage Flood Plain Flooded Strand Foreboding Landscape Ghost Quarter Grasslands Grixis Panorama Jund Panorama Krosan Verge Maelstrom of the Spirit Dragon Maestros Theater Marsh Flats Misty Rainforest Mountain Valley Myriad Landscape Naya Panorama Obscura Storefront Perilous Landscape Polluted Delta Prismatic Vista Promising Vein Riveteers Overlook Rocky Tar Pit Sanctum of Ugin Scalding Tarn Seething Landscape Shattered Landscape Sheltering Landscape Shire Terrace Terminal Moraine Terramorphic Expanse The World Tree Tranquil Landscape Twisted Landscape Urza's Cave Verdant Catacombs Vibrant Cityscape Volatile Fault Warped Landscape Windswept Heath Wooded Foothills

Delirium, which first showed up in the two-part Shadows Over Innistrad/Eldritch Moon block, is a mechanic that gives your cards a bonus under the condition you have four or more different card types among cards in your graveyard
Okay, thats one color established
sending out query letters that included three 4 x 6 inch photos of my work with a pre stamped response postcard