REDU format ruling
Reasoning

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Your opponent declares a monster Level from 1 to 12. Excavate cards from the top of your Deck until you excavate a monster that can be Normal Summoned/Set, then, if that monster is the same Level as the one declared by your opponent, send all excavated cards to the GY. If not, Special Summon the excavated monster, also send the remaining cards to the GY.
Rulings
- You can't activate this card if you have no monsters that can be Normal Summoned/Set in your Deck.
- You can't activate this card while "Vanity's Fiend" is applying.
- If you reveal a card that can't be Summoned because EG "Power Filter" is applying, send all cards to the GY.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.