I like to see the game growing, every time there is a new update i run to see what's new.
When there are new cards, i run to get them and to try some combinations.
And it's wonderful that the game evolve on community feedbacks. Well, not always, but we can make cards for the game! It's awesome!
Also, i like to partecipate in competitions, mostly creative ones, but i did some PvP weekly tournament when i'm home and i got the time to play. Never won more than few rounds, but the preparation gave me a boost of motivation in deckbuilding, testing, simulating, thinking of what kind of decks i might encounter and how to counter them.