If you're referring to a (e.g., TCGs like Magic: The Gathering , Hearthstone , Gwent , or a custom board game), a discard credit generator is an engine piece that turns discarding cards into a resource (mana, points, currency, etc.) rather than a pure cost.
Here’s a you can drop into most strategy games: Card / Ability Name: Salvage Scrapper Type: Permanent (Artifact / Unit / Enchantment) discard credit generator