REDU format ruling
A Feather of the Phoenix

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Discard 1 card, then target 1 card in your GY; return that target to the top of your Deck.
Rulings
Discard 1 card. Select 1 card from your GY and return it to the top of your Deck.
- Discarding 1 card is a cost. Your opponent can chain D.D. Crow.
- This is an effect that targets.
- You can target a Fusion / Synchro Monster in the GY, but it is returned to the Extra Deck.
- You can target the card you discarded for the cost of A Feather of the Phoenix to be the card returned to the top of your Deck. If you discarded Night Assailant or Makyura the Destructor, then their effects will activate.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.