You don't need to have anything else in play like other top-tier lands Gaea's Cradle or Tolarian Academy
Below the copyrights theres some kind of note thats hard to read it might say something like Not legal for tournament play. Zacian LV.X also has the old Poke-Body mechanic, which would be incompatible with todays cards
If you use this card, I wouldn't use more than one in a deck, but it would be a deck that is heavy in Team Plasma Pokemon so you're going to have Team Plasma energy cards to use on those Pokemon and this Dialga EX Full Art card
Its a decent creature on rate, a 2/2 for two which can gain some card advantage, and the enlist keyword makes it a great attacker, too
Even so, in the right shell, it threatens to grow at a remarkable pace for a two-drop
Auto-attaching a big Equipment lets him hit for huge damage while keeping you gassed up with both mana (from the Treasures) and cards