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The allows you to obtain Skyshards, Chests or Lockpicks. You can also find some cards while the Week-end and restoring all your Arena Tickets.

Chests:
Get chests that are better provided!

Lockpicks:
Use lockpicks to open your chests faster!

Arena Tickets:
Refilled Arena Tickets from all arenas at once!

Cards:
Gets some cards to improve them!

It depends which league you are in to get cards.