If you want to throw real money at Arena , you can buy gems, which are spent to buy larger numbers of booster packs at once, but all you really get for your cash is immediacy and convenience
At Nahiris call, Emrakul traversed the vast emptiness between the planes and arrived on Innistrad
Rapunzel, Letting Down Her Hairs lore-draining power makes her the perfect ruby card to pair with the likes of Aladdin, Heroic Outlaw and Mulan, Imperial Soldier, as you sap away your opponents lore totals and boost your own.
Conclusions As card advantage has been spread more widely between colors (not being only in blue), black has gotten better at it
You have a dual land or two to hit 8/8 color minimums while also having the kind of mana curve that would want 15 lands in the first place
Smuggler's Share What's better than a white mana ramp card