Theres lots of Chien-Pao/Baxcalibur, Lost Box, and Gardevoir
You can hold a maximum of 2 booster packs, so open them right away to make room for the next one
Play big dumb dragons and smash
In the same vein, in the first product ever released for the Universal Fighting System, the Penny-Arcade Battle Pack, Tycho overclassed Gabe by a mile as one of the strongest characters in the game, where Gabe is largely considered one of the worst
The side deck was primarily built for Gouki and the mirror match, as evidenced by the inclusion of PSY-Framegear Gammas, Mind Controls and Super Polymerization
Being able to pull out from the opponent's Graveyard offers Zombie World synergy, but to rein in potential combos and keep them temporarily vulnerable, they come back with 0 DEF in Defense Position, and there's a once-per-turn-per-copy clause to prevent Box from indefinitely reviving itself