It costs to cast, or it can be suspended for and four turns
It rewards you if you go wide and are unafraid to sacrifice your troops and your resources for profit
Not being able to hit lands really sucks because there's so many annoying lands that need blowing up (Maze of Ith) but if you're a Black/Red deck and desperately need answers to enchantments then Meteor Golem might work: Rakdos, Lord of Riots is the most likely candidate
Use it to benefit your own board in decks that run Haunted One, preventing you from having to attack with your commander or tap down your Kalamax, the Stormsire to start copying spells
they're perfect for building decks, playing games with friends, and are tons of fun to open
Dredge is beatable if you pack at least four graveyard-disruption cards in your sideboard, just like Affinity is beatable if you have a bunch of artifact hate, Tron if you have Fulminator Mage, Infect if you have Sudden Shock and Gut Shot, and Death's Shadow Zoo / Burn if you have Chalice of the Void