what i propose is a way that more people will play in folrart, and also happier: Both people get the treasure card from a treasure battle, whether win or lose!
There could be a way to do that while keeping the initiative to win. What if you get like 1/5 or 1/3 of the treasure card ... so if you lose 3 or 5 times at a 5 star then you get that 5 star.
The system might be complicated. For example you get a shade treasure battle and lose it, so you get a shade with a 1/5 on it in your card collection (let's just call it a "1/5 shade card"), when you lose another shade treasure battle you get another "1/5 shade card".
There could even be various % of gaining, so at times you maybe gain 11/100 of a card and other times 33/50. So when you get more than 100% of a card or just 100%, then you can cash in those pieces for the full card!
You can exchange "1/100 Animus card" + "57/100 Animus card" + "2/5 Animus card" for a full Animus card.
Or they go with the old and trust-worthy point card system and give 1/10 point cards of the cards worth! But the system above looks fancier and more interesting, it gives a better feeling over all, so i would suggest that one. ^^