Ugin, Eye of the Storms While this is priced to move in Modern, where it's easy to go 1-2-7 with your manabase thanks to the Urzatron, I can see it sneaking into a Standard deck
The ten most valuable cards brought by the Pokmon TCG are not only more expensive due to their amazing potential for competitive play, but also because of rare and exclusive artwork that makes them worthy of a museum, rather than a deck box
Veteran players likely already know exactly which card to pair with an Overloaded Vandalblast: As Commander Spellbook informs us, all you need is a Mycosynth LatticeMycosynth Lattice on the field to blow up every permanent, lands included, that your opponents control
If you activate Fires of Mount Doom's last ability but don't play the exiled card this turn using that casting permission, Fires of Mount Doom won't deal damage to each player
You also need to make sure you hit your land drops, either with draw effects (Qiqirn Merchant and Adventurers Airship provide usable bodies as well as draw smoothing) or cards that directly give you lands or mana (World Map, landcyclers, Blitzball)