I have heard they are valuable

Plushies are given out as rewards for quests during the anniversary, as well as for being logged in during the anniversary

Plushies are a reward currency available during the MagicDuel Birthday. There are three primary ways of gaining these:

1. If you are online during the birthday, at random times of day and night plushies will be given out. All online accounts will be given one (or more) plushies when they are given out

2. Hosting a quest will typically give a predefined number of plushies once you report the results. This number changes for each MagicDuel Birthday

3. Participating in a quest will typically also give a number of plushies once the result is reported. The number is also up for change every year.

Here are the lists of all methods through which you can obtain plushies:

• Being online or idle state in the realm, when they're given out. They're given out randomly during the anniversary
• Hosting a quest. You gain 8 + 2 x participant for all quests with 2 or more entries (numbers may change)
• Participating in a quest. You gain 5 per valid entry (number may change)
• Purchasing it from other players. Note that plushy trading tend to be disabled for a period of time after the end of the anniversary, in anticipation for the anniversary shop and auction
  • You may still bargain with other players to use their plushies. Just that no physical transfers may take place