all sword and shield booster boxes Pokemon TCG & Base Set Box – PokeWayne giving you the chance to pull rare holos S1W-Sword V Japanese Pokemon Booster

But if we are simply talking about the initial battle effect, then this is actually pretty playable card

Fabled decks are based around discarding themselves in order to get powerful effects, with certain Monsters gaining effects if you don't have many cards in your hand

This is one of the classic starter cards, after all

6 Evilswarm Exciton Knight is an Iconic, Board-Breaking Tool First Printing: Legacy of the Valiant Board breakers are often an integral part of the game, as these cards can be the only way that a player can get back into the game when they are forced to go second and the opponent builds an insurmountable board