Counterplay is incredibly generous with their dust and gold rewards, but playing the same 8 quests everyday gets kind of stale, so here are some quests I stole from Hearthstone, and some I came up with, to shake things up a tad. Let me know what you think, and feel free to add your own ideas for more quests, if you feel we should even have anymore!
Friend, or Foe? - Play a friendly match against someone on your buddy list. Reward 20 gold.
Spelljammer - Cast x (5? 10?) number of spells in an online match. Reward 25 gold.
Conqueror - Destroy 10 minions in an online match. Reward 30 gold. (Assassin v.2)
World Wanderer - Play 1 online match with every faction. Reward 60 gold. (10 gold for each faction.) (Faction quests, v.2)
Seventh Star - Play 1 online match against each faction. Reward 60 gold. (10 gold for each faction.)
The Senerai - Win 1 online match with every faction. Reward 100 gold.
War Master - Win 1 online match against every faction. Reward 100 gold.