REDU format ruling
Cyber Dragon Zwei
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)If this card attacks an opponent's monster, it gains 300 ATK during the Damage Step only. Once per turn: You can reveal 1 Spell in your hand; this card's name becomes "Cyber Dragon" until the End Phase. This card's name becomes "Cyber Dragon" while in the GY.
Rulings
- Revealing a Spell Card is a cost.
- If you activate "Inferno Reckless Summon" when "Proto-Cyber Dragon" is Summoned while you have 1 "Cyber Dragon" in your Deck and 3 "Cyber Dragon Zwei" in your GY and only 3 Monster Card Zones open, you choose which monsters you want to Special Summon. Any monster that you cannot Special Summon is sent to the GY.
- When "Cyber Dragon Zwei" attacks, it gains 300 ATK at the start of the Damage Step and keeps it until the end of the Damage Step.
- If "Cyber Dragon Zwei" is being treated as "Cyber Dragon" by its own effect and "Skill Drain" is activated, the name is still treated as "Cyber Dragon."
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.