This idea works completely off of trading up. If you have a card, you can recycle that card (For a small credit fee) and keep a weapon from the card (“Weapon Card Fragment”) or a perk from the card (“Perk Card Fragment”). The card fragments will be attached to the merc and rarity they were taken from*.
You can use up to two card fragments in a tradeup, though there can only be one Weapon fragment per tradeup and each fragment must exist together on an existing loadout card; i.e. You can’t have Explodydendron and Failsafe on an Arty tradeup, as there is no card with those two perks together.
Once you select the merc and up to two fragments, you can then trade up (Adding fragments adds some more credits to the tradeup fee), and, as you may have guessed, the card received is guaranteed to have both fragments in it (May be changed to only one guaranteed for more RNG).
And that’s all there really is to it! Gimme your opinions and feedback below!
*: The rarity thing can be changed to either an existing rarity fragment can either trade up to the same rarity or the rarity above it, or upon recycling the fragment is one rarity lower. The latter will obviously mean you cannot recycle lead cards. These specific features will mean you can recycle your cobalts!
TL;DR: Elements of cards can be used in tradeup for less RNG in loadouts at the cost of more credits, also lets you recycle cobalts to get a new card.