SCP 4135 The Maullard

Indestructible, Shroud
Enchant creature you don't control
When SCP 4135 enchants a creature, create a 1/1
legendary bird creature token with flying, shroud
and indestructible named SCP 4135-B.
Enchanted creature and SCP 4135-B must block
each other if able.
When enchanted creature leaves the battlefield,
sacrifice SCP 4135-B.
If SCP 4135 would leave the battlefield, instead
enchant creature you don't control if able.