when you discard a card mtg Creeping Dread - Shadows over Innistrad #104 (English) You may play that card this turn The 50 Best Discard Cards

The card Triskaidekaphobia which causes players on exactly 13 life to lose the game is already confirmed for an Innistrad Remastered reprint, and it would be a real shame if its blue mana counterpart were passed over

Assorted colors and sets

Omo, Queen of Vesuva showcases an intriguing new everything counter, which doesnt do anything outside of working with Omos ability

(Whenever a creature attacks alone, it gets +1/+1 until end of turn for each instance of exalted among permanents its controller controls.) Whenever chaos ensues, put a divinity counter on target green, white, or blue creature

View card in Alfred

I'll also give some replacement options, and bonus mentions as well