This way, you won't influence the test group with your opinions or accidentally add supplemental information players wouldn't normally have
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)
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
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