8 Heralds Horn You Never Know Whats Coming Next As the standard for great kindred cards, Heralds Horn is almost an auto-include in any deck focusing on a specific creature type
Let's take a look at the most valuable as an example: Brightglass Gearhulk
The Grim Captain's Locker can let you cheat the mana cost on creature cards in your graveyard, casting something absurd like Atraxa, Grand Unifier from your graveyard for only 4 mana
The End Effects that remove all copies of a card from a deck usually can't deal with whats already on board, which makes The End really unique
Chase cards are also popular and in limited supply, so the value of these cards can skyrocket
Set designers don't create cards specifically with Pauper in mind, but due to the dominance of Cranial Plating in that format, it was pretty much a known factor how problematic Cranial Ram would be if it were allowed to run free