Here are the most expensive cards you can find in Prismatic Evolutions, and why they can go for so much
Once you turn this on, 4 mana to clone stuff every turn is hard to beat on a land, and decks that already have token doubling shenanigans, populate, and the like will clearly want this land
The Cipher ability will resolve after the rest of the spell's effects (one way of thinking about it is the Cipher ability goes on the stack, then the rest of the spell's abilities do too, but you can choose to reorder it)
Heralds Horns cheapest variant is about $4.75, which is neither a strong nor disappointing Box Topper
Choco, Seeker of Paradise I imagine Choco, Seeker of Paradise will eke out Kastral, the Windcrested as EDHs best bird commander, if only because adding green to the mix makes any casual EDH deck better
30th Anniversary Edition Presented without comment