Most of our single cards are second-hand, carefully checked, but some can also come directly from recent openings.
: You may exile an instant or sorcery card from your hand and put three hone counters on it. It gains "At the beginning of your upkeep, if this card is exiled, remove a hone counter from it" and "When the last hone counter is removed from this card, if it's exiled, you may cast it. It costs 
less to cast this way."
Strixhaven: School of Mages Promos