Suggestion: New Event Fblthp-esque,

I read recently a post where somebody asked for a way to improve the experience for new players (due to how difficult is to find rivals in bronze or silver levels).
My suggestion is a PvP with similar mechanics to one of Fblfhp events: you have to play with common or uncommon cards, and no cost over 12.
Prizes: you would get only a rune reward for each victory, and points for extra rewards only if you follow the requirements (so, no meta decks ruining the experience).
This event would be a free for all, so players from any lvl would meet and play.