I have been with Splinterlands Since like day 1 or 2 aswell :D
I got at least 5 Arianthuses aswell just from playing, but I, thinking that it's a bad card, sold them all at the time.
(I thought that, What a dumb card, it has no attacks. Boy was I wrong)
I bought a lvl 2 Arianthus back at 5$ BCX.