The reasoning behind this is a simple - yet effective - method that ensures the Pokmon world can appeal to as many audiences as possible
Im more curious about this in some kind of blink shell (think Roon of the Hidden Realm decks in EDH), although Im not sure you want an 8-drop there
What colors you choose to run is up to you, but some colors work better with some deck types than others
Dominaria United was the first set to feature these promos
As Ari Lax put it: Its a Clue that turns into a big thing. Gallery and List of Incubate Cards Assimilate Essence Blighted Burgeoning Blight Titan Bloated Processor Brimaz, Blight of Oreskos Chrome Host Seedshark Compleated Huntmaster Converter Beast Corruption of Towashi Elesh Norn / The Argent Etchings Elvish Vatkeeper Essence of Orthodoxy Excise the Imperfect Eyes of Gitaxias Furnace Gremlin Gift of Compleation Glissa, Herald of Predation Glistening Dawn Ichor Drinker Infected Defector Injector Crocodile Marauding Dreadship Merciless Repurposing Norn's Inquisitor Phyrexian Awakening Progenitor Exarch Sculpted Perfection Searing Barb Sunder the Gateway Sunfall Tangled Skyline Tiller of Flesh Traumatic Revelation Best Incubate Cards The best incubate cards have proven themselves across multiple formats, from Cube to Standard
Many of the bot algorithms adjust their prices in exactly this way, slowly increasing their price after every sale and slowly decreasing it after every buy