Dormir, The Imprisoning Thief

When Dormir, The Imprisoning Thief deals
damage to a creature it's control rolls a d20. If the roll is 12 or lower exile that creature.

If Dormir, The Imprisoning Thief is not blocked or
is blocked by two or more creatures they gain double strike and deathtouch.

{2}{u}{b}: Return up to one target creature from exile to the battlefield under your control.