REDU format ruling
Solar Flare Dragon

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)While you control another Pyro-Type monster, this card cannot be attacked. During each of your End Phases: Inflict 500 damage to your opponent.
Rulings
- If you have 2 Solar Flare Dragons, or a Solar Flare Dragon equipped with Raregold Armor and another Pyro-Type monster, your opponent cannot attack.
- Even if Solar Flare Dragon's Type is changed, as long as there is another Pyro-Type monster on your side of the field, Solar Flare Dragon cannot be attacked.
- You can apply Barrel Behind the Door to the effect of Solar Flare Dragon.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.