Advanced format ruling
Slip Summon
Card effect (current official text)Activate only when your opponent Summons a monster. Special Summon 1 Level 4 or lower monster from your hand in face-up Defense Position. Return it to the owner's hand during the End Phase.
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.