I've been thinking about it and i'm not sure if it'd be asking too much or if it's something that should've been this way from the very beginning. I feel like there's enough rares, especially relatively under powered ones, for this to be fine, especially when you take into account that the ICRs don't have proper duplication protection. Also, it'd be a nice reward for people who bothered playing their game long enough in a day to accrue 15 wins, and likely closer to 25-30 depending on their winrates.

Edit: Or should there be a rare ICR at all in the daily wins? Maybe the 5^th spot after all the gold? Maybe shift the gold into the 2^nd to 5^th spots and make it the 1^st win reward? Should we have a daily rare ICR at all?