If you happen to find the kind of legendary snipes that can lead you to buy cards for much less than they are worth, you may think about "flipping" the cards you have by placing Mut 24 coins them on auction for a more normal selling price (this is where the Buy Now filter can come in handy, allowing you to determine how much buyers are prepared to for) and thereby helping make money from the transactions you could be used for other purchases. Repeat the process and you will see your money making money.
Missions are brand new to MUT this year and though some appear to be merely reminders of all that you can do in the MUT mode (and may be more clear regarding the rewards you'll earn when they're completed) There are other missions that offer some good rewards for achieving achievable goals.
The easiest is likely the daily challenge of the "MUT Dedication" series that will require you to win two games, and then purchase an item in the retailer. We've seen that buying packs from the stores isn't a good idea I'd recommend taking the most affordable pack available (the Buy a Player pack for 500 coins) to meet all the goals. The weekly goals can also provide you with at least a few tasks you can accomplish without too much commitment, allowing you to earn additional coins to put in your savings account.
You should also take note of rewards you earn as you keep advancing to new levels by playing games, since each can help you unlock something brand new. In some cases, it's just an entirely new set of challenges you'll be able to finish however, you'll also receive things such as Gold packs and training points, and power-up passes are able to help you get you "Power to Power" gamers to the elite level more quickly. If you can unlock special deals on packs buy Mut 24 coins available in the shop, it's among the rare occasions when you may decide to take a break and spend a little more on a pack that is sure to include something of value.