REDU format ruling
Cyber Jar

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)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.)
Rulings
- Spirit Monsters, Toon Monsters, Ritual Monsters, etc. are sent to your hand as they cannot be Special Summoned or must be Special Summoned is a specific way.
- Both players reveal all 5 cards to each other, and then the turn player may Special Summon his monsters, then the opponent. After revealing the cards, you may shuffle them around so you can Special Summon monsters face-down without the opponent knowing which monster is which.
- If Sangan or Witch of the Black Forest was destroyed by Cyber Jar’s effect, Special Summon monsters first and then complete Sangan’s effect.
- If you attacked your opponent’s face-down Cyber Jar, after its effect resolves you can then attack with any monsters you Special Summoned in Attack Position before you enter your Main Phase 2.
- Torrential Tribute can be used on monsters Summoned by Cyber Jar but not if Cyber Jar was flipped face-up in the Damage Step, since Torrential Tribute cannot be activated during the Damage Step.
- If a player has less than 5 cards in their Deck, they do not lose (since you are picking-up cards, not drawing), they pick up however many cards they have and continue with Cyber Jar’s effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.