Like most Magic: The Gathering cards, the value of Unstable Mutation 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 (Ultimate Masters)
Call the Skybreaker Caller of the Claw Caribou Range Centaur Glade Charforger Chatter of the Squirrel Chicken Egg Cloudseeder Creakwood Liege Dance of Many Dark Depths Deadly Grub Deathspore Thallid Diamond Kaleidoscope Din of the Fireherd Dragon Broodmother Dragon Roost Dripping-Tongue Zubera Drudge Spell Duchess, Wayward Tavernkeep Dune-Brood Nephilim Echo Chamber Elephant Ambush Elephant Guide Elspeth, Knight-Errant Elvish Farmer Elvish Promenade Endless Swarm Errand of Duty Eyes of the Wisent Fable of Wolf and Owl Feast or Famine Feudkiller's Verdict Field of Souls Flash Foliage Flock of Rabid Sheep Flourishing Defenses Followed Footsteps Forbidden Orchard Form of the Squirrel
This one is arguably the best
Card Text: At the beginning of your end step, create a Treasure token for each tapped Assassin, Pirate, and/or Vehicle you control
The alters I've shared are all from early in my process of learning how to paint on Magic cards
When the enchanted creature becomes a copy of the target creature, it's neither entering nor leaving the battlefield
