Advanced format ruling
Mist Wurm
Card effect (current official text)1 Tuner + 2 or more non-Tuner monsters
If this card is Synchro Summoned: Target up to 3 cards your opponent controls; return those targets to the hand.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.