So I had an idea for a new custom mechanic, Sabotage. When a card with Sabotage is played (creature, sorcery, etc.) , you choose an opponent, and choose one of the following: That opponent takes 2 damage, or discards a card.
Here is an example: https://mtgcardsmith.com/view/young-assassin
(yes I forgot to add p/t 'cuz im a doof)
If you have an idea how this mechanic would be worded, please let me know! I tried looking around for similar MTG abilities but couldn't find any. Cheers