Some players end up spending hundreds if not thousands of dollars on lands alone just for a single deck
Like most Magic: The Gathering cards, the value of Jareth, Leonine Titan 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 (Onslaught)
Furthermore, the deck also comes with a copy of a code for the original Final Fantasy VII video game itself
The copied version is now a token, but thats almost as good, especially in Commander
However, to get full value out of this ability, we really need to have an equipment in play and I think that's where the deck falls short out of the box
While Rogue is not more powerful than Pia and Kiran Nalaar, the activiated ability (and only difference bar the cost to the cards) being no mana and instantly useful makes it have greater impact in cube, simply through happening sooner and more often