Welcome to Four Daily Wins, your one stop reference for how to get the most bang for your buck in the Magic: The Gathering Arena Free to Play Experience.
Maximizing Daily Quests
The Bottom Line: Don’t rush to complete a quest as soon as possible unless it’s worth 750 gold. Exploit your daily Quest Refresh to wring as much gold out of quests as you can. Build five monocolor decks for the Play or the Brawl queue, and keep them updated as you acquire new cards, so you can be selective about which quests you complete each day. Don’t worry about this while drafting. You can’t easily control what colors your deck will be. This only applies when you’re grinding for gold in the constructed queues.
But Why?
Every day, Arena provides you with a random quest, such as “Cast 30 blue or black spells” or “Attack with 45 creatures.” If you don’t complete that day’s quest, it doesn’t go away, but Arena only lets you save up three quests at a time, and after that, you won’t receive any more until you complete one. You’re allowed one reroll each day (just click on the quest you want to reroll), and it doesn’t have to be for the most recent quest.
Most of the time you’ll get a quest worth 500 gold, but sometimes you’ll get one for 750 gold. This means that you should NOT reroll quests for 750 gold and should ALWAYS reroll quests for 500 gold if you can.
If you take all that together, we can conclude that, when possible, you should AVOID completing 500 gold quests unless you have three unfinished quests, and you should complete 750 gold quests as soon as you can. For some quests, such as playing lands and attacking with creatures, there’s not much you can do (so prioritize refreshing those, if you have a choice), but most of the quests involve playing spells of a specific color. That’s where those mono-colored decks come in.
Let’s say that after you’ve used your daily refresh, these are the two quests you have available:
Your goal should be to complete the 750 gold quest while leaving the 500 gold quest untouched. How do you accomplish this safely? By using a monoblue deck in the Play queue. This way, you’ll be able to satisfy the good quest, leaving the bad one eligible for a reroll the following day.
This matters because there is a chance that your new quest on the following day will be worth 750 gold. You don't want to reroll that one, so just use it on the older 500 gold quest!