Black is a colour in the cube that has many cards that need support, when you play one card like Gravecrawler you find yourself wanting to play zombies, discard and sacrifice effects to optimise it
These enchantments are only around for a short amount of time, with a built-in timer for how long they can stay on the battlefield
Once you have enough Treasures, you can dump all that mana into a Hellkite Charger, and you have yourself an infinite combat loop
Instead, these cards have been officially revealed, which is hugely exciting, given how insane these promos are
It's been a tradition ever since I was a teenager and stems from my many years prior to that enjoying stuff like Goosebumps , Scary Stories to Tell in the Dark , and the various works of Bruce Coville that would really lead to my love of all things spooky and creepy
That being said, the mechanic itself is so powerful that even decks that play a regular number of creatures can find a use for convoke cards