Cyber Jar (BP02-EN007)

FLIP: Destroy all monsters on the field, then both players reveal the top 5 cards from their Decks, then Special Summon all revealed Level 4 or lower monsters in face-up Attack Position or face-down Defense Position, also add any remaining cards to their hand. (If either player has less than 5 cards in their Deck, reveal as many as possible.)

Rock / Effect, Battle Pack 2: War of the Giants