These coins come in a variety of styles and can be added to through in-store purchases as well as through special missions These become open to you when you open the Battle feature when you hit Level 3.
the primary fear is color-hosing and in combination in particular with Iona, Shield of Emeria
For example, if a permanent with a finality counter on it would be put into its owner's hand from the battlefield, it does so normally
However, not all fans of the cards are in it for the battles
This is awesome to make people like you as you all draw cards, but it's not ideal since in multiplayer you are being outdrawn 3:1 in a four-player game naturally and now 6:2 with you
It has amazing ageless art, but it also draws a card, has flying and deathtouch as a 1/1 for one mana, and is a perfect creature for control decks