Like most Magic: The Gathering cards, the value of Arcbound Tracker depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Modern Horizons 2)
though it deals no damage, it devolves each of your opponents evolved Pokmon, taking the highest current stage card from each of them and shuffling them back into your opponents deck
For each of those tokens, you may put an Aura card from your hand and/or graveyard onto the battlefield attached to it
Whether you've played Magic: The Gathering or not, anyone who is familiar with at least one card game will be able to tell you about the graveyard
The financial value is secondary to the joy of collecting
In this case, abilities that trigger "whenever the Ring tempts you" will still trigger