if you are familliar with modern yugioh, you know about "hand traps". hand traps are cards you can discard or reveal from your hand to use an effect.

here is an example of a hand trap implementation. "Mooninites"

you just banish (exile) it from your hand (on any player's turn), and you can nullify (remove all effects, brick it) any card in play. these hand traps function similarly to ash blossom or infinite impermanence and are just as useful.