cell phone booster box weBoost Dash Vehicle Signal (471082) setting up the device is a breeze Fusion4Home Omni Whip Cell Phone

Of course, that depends on what you think is the best the most expensive, the rarest, the strongest, or the ones that are just plain cool

1x Duress

Once per turn: You can shuffle 1 "Gladiator Beast" monster from your hand or GY into the Main Deck, then target 1 "Gladiator Beast" monster you control

The basic effect of the spell still works if you cast a rebound spell from outside your hand, but the rebound ability doesnt trigger because the rules specify if the spell was cast from your hand. How Does Rebound Work With Copies Of Spells

Zacian V is busted, that's my takeaway from this

avoid paying Secret Rare premiums unless the SEC version of a card is also the only competitively viable version (which is rare in OPTCG)