Mo-ma, the Ceaseless Sting

Deathtouch
Whenever one or more +1/+1 counters would be placed on Mo-ma, the Ceaseless Sting, you may instead create a 1/1 blue Tentacle creature token.
Whenever a Tentacle you control deals combat
damage to a creature, tap that creature. It doesn't
untap during its opponent's next untap step.