REDU format ruling
Guardian Kay'est

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Cannot be Summoned unless you control a face-up "Rod of Silence - Kay'est". This card is unaffected by Spell effects and cannot be targeted for attacks, but does not prevent your opponent from attacking you directly.
Rulings
- Guardian Kay'est is not affected by Spell Cards, just like The Legendary Fisherman.
- Your opponent cannot select Guardian Kay'est as the target of an attack.
- If Guardian Kay'est is your only monster on the field, your opponent can attack your Life Points directly.
- As long as Guardian Kay'est cannot be selected as the target of an attack, it cannot be targeted by the effect of Staunch Defender, either.
- If Guardian Kay'est and another monster are selected for Creature Swap's effect, Creature Swap's effect is negated because switching is impossible.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.