Like most Pokmon cards, the value of Onix 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 (Unseen Forces)
For example, if a spell requires that you exile cards from your graveyard, you can exile cards from any graveyard
Unfortunately for players looking to obtain these lands, the Guru Program was rather short-lived
Noticeable improvements When I first got a beta code earlier this year, the game was in a much rougher state, and I found myself with no real idea how to play
This one may be the easiest to break wide open, considering you can get clue tokens from other cards and effects, possibly allowing massive tutoring
If it's not a Vehicle, it has base power and toughness 1/1 until end of turn