REDU format ruling
Millennium Scorpion

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Each time this card destroys 1 monster on your opponent's side of the field by battle and sends it to the Graveyard, this card gains 500 ATK.
Rulings
- The effect of "Millennium Scorpion" is a Trigger Effect. Each time it destroys a monster on your opponent’s side of the field and sends it to the GY as a result of battle, it activates. This effect can be chained to. You can activate "Divine Wrath" against it.
- If "Millennium Scorpion" attacks and destroys a Monster Token, the effect of "Millennium Scorpion" does not activate because a Monster Token isn’t sent to the GY.
- If "Millennium Scorpion" has an ATK boost from its effect, but is removed from play with "Interdimensional Matter Transporter", or flipped face-down, the effect is reset and its ATK returns to normal.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.