I usually use btc and xrp for playing gamble in prime dice. But if there had other crypto like bat, ae, xlm I would paly more. By the way Plying gamble here I feel lucky because I won several times and I doubled my coins playing gamble here. It's so easy to play gamble here like dice or any other gamble.
Trading btc is easy to ether. You can use any exchanges for trading this. All most every exchange support this and most of the exchanges are based on btc or ether. So I don't think there is any problem od trading btc to ether. I can suggest you please use Yobit or Binance or any other exchanges.