Like most Pokmon cards, the value of Deoxys 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 (Chaos Rising)
TJs recommended decklist: DECK #4: DRAGAPULT EX Dragapult ex (TWM 130) is already a deck that was very competitive in the previous format, and it is the only deck out of the previous Big 4 that doesnt rotate
Were down to 16 words now, but were still a bit backwards on the Atogs famous artifact-munching talent
This emotional premium is irrational by traditional valuation standards, but it is remarkably consistent
Penny sleeve plus a top loader at minimum, a graded slab for long-term holding
Unless you have multiple six-plus drops and/or card draw spells, having to ink two additional cards to play a single seven-drop is a risky proposition