REDU format ruling
Archlord Kristya

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)If you have exactly 4 Fairy monsters in your GY, you can Special Summon this card (from your hand). If Summoned this way: Target 1 Fairy monster in your GY; add that target to your hand. Neither player can Special Summon monsters. If this face-up card would be sent from the field to the GY, place it on top of the Deck, instead.
Rulings
This card is returned to the top of the Deck if:
- It would be sent to the GY while "Macro Cosmos" is applying.
- It would be sent from the Spell/Trap Zone to the GY.
This card is NOT returned to the top of the Deck if:
- It is destroyed and banished by "Bottomless Trap Hole".
- Its Summon is negated by "Solemn Judgment" or "Thunder King Rai-Oh".
- It would be sent from the field to the GY while "Skill Drain" is applying.
- It would be sent from the field to the GY while "Grave Protector" is applying.
- It would be sent from the field to the GY while "G.B. Hunter" is applying.
- It would be sent from the field to the GY while face-down (unless it was destroyed by battle).
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.