Mark Ritual would be particularly beneficial in a black-red (Rakdos) deck that focuses on aggressive strategies or combo setups, as it allows for a significant mana boost while potentially converting black mana into red mana for spells or abilities that require red
Originally this wasnt so useful, but with the new fusion monsters, Thunder Dragon Colossus and Thunder Dragon Titan, all you have to do is use any effect that activates in the hand (which every thunder dragon monster does) and then send 1 thunder monster to the graveyard to get Colossus out
This is good if you want cards for friends or your tcg group
Even though you only make them discard one card, you get a significant threat
If you spend mana and a card on this, you're going to lose
Beast Within Beast Within is another anything-goes removal spell that gets reprinted often