im rank 19 with 2 stars
won most of my games on ranked went to 20 losing only 1 then sat on 20 for a few games going up and down

i lost most of my games on c asual
casual is much harder i play vs people with full decks built from the new card packs

i dont recommend casual to new players i actually recommend ranked.

casual is based on MMR

if you just concede 50 games straight you'll be placed against new players with basic cards and basic card back