That sounds like it'd work well. Other cards could use that mechanic to convert in-play cards to materials or vice versa.
This game gives me Dvorak and 1000 Blank White Cards vibes because of how community driven the card making is, which is a great thing. If anyone needs inspiration, there are Dvorak decks online which are a treasure trove of neat mechanics and ideas (try http://www.dvorakgame.co.uk/index.php/Infinite_Dvorak_deck).