Special Summon 2 "Lamb Tokens" (Beast/EARTH/Level 1/ATK 0/DEF 0) in Defense Position. You cannot Summon other monsters the turn you activate this card (but you can Set).
Rulings
Individual Card FAQs
You cannot activate "Stray Lambs" the same turn that you Summon, Flip Summon, or Special Summon. But you can perform a Set the same turn. So you can activate "Stray Lambs" and then Tribute one of them to Set "Labyrinth Wall".
You can't activate "Stray Lambs" unless you have at least 2 vacant Monster Card Zones.
Spell|
Normal