REDU format ruling
The Agent of Force - Mars

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)This card is unaffected by any Spell Cards. While you control a face-up "The Sanctuary in the Sky" and your Life Points are higher than your opponent's, this card gains ATK and DEF by the difference between your and your opponent's Life Points.
Rulings
- The Agent of Force - Mars is unaffected by Spell Cards just like Guardian Kay'est and The Legendary Fisherman.
- Vs. Reverse Trap, The Agent of Force - Mars' ATK & DEF become zero but cannot go below zero.
- If The Agent of Force - Mars attacks Reflect Bounder, Reflect Bounder deals damage based on The Agent of Force - Mars' current ATK, so if it has 2000 ATK, then Reflect Bounder inflicts 2000 damage; then recalculate The Agent of Force - Mars' ATK before performing damage calculation.
- When your face-down Defense Position The Agent of Force - Mars is attacked, its DEF is increased BEFORE damage calculation.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.