REDU format ruling
Urgent Synthesis

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Return 1 "Iron Core of Koa'ki Meiru" from your Graveyard to the Deck. Special Summon 1 Level 4 or lower "Koa'ki Meiru" monster from your hand or your Graveyard.
Rulings
- Returning 1 "Iron Core of Koa’ki Meiru" to the Deck is a cost to activate "Urgent Synthesis." The effect does not target. You cannot activate "Urgent Synthesis" while "Transmigration Break" is active, as you cannot pay the cost to return "Iron Core of Koa’ki Meiru" to the Deck.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.