Irregular Cohort

Changeling (This card is every creature type.)
When Irregular Cohort enters, create a 2/2 colorless Shapeshifter creature token with changeling.

Transcendent Envoy

Flying
Aura spells you cast cost {1} less to cast.

Changeling (This card is every creature type.)

Changeling (This card is every creature type.)
{1}{B}: Regenerate Skeletal Changeling.

As long as you control a Griffin creature, Griffin Rider gets +3/+3 and has flying.

Changeling (This card is every creature type.)
Changeling Outcast can't block and can't be blocked.