Here's a short list of potentially playable cards that allow you to discard aftermath cards for value: As you can see, while red, black, and blue have the most discard outlets, in theory, you can make a discard theme work in just about any color thanks to colorless options like Key to the City and Geier Reach Sanitarium
The Wandering Rescuer + Odric, Lunarch Marshal Alien had Ripley
Up until that point, no one had any inkling that Retro Frame artifacts would be the theme
This three-mana black sorcery lets you destroy a target creature, before its controller loses three life
I wouldnt run Winged Boots as a protection spell, but its an amazing source of flying with commanders like Yuriko, the Tiger's Shadow and Obeka, Splitter of Seconds that are desperate to connect