Roaming Throne

As this creature enters, choose a creature type.

This creature is the chosen type in addition to its other types.

Other creatures you control of the chosen type get +1/+1.

If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

As this Vehicle enters, choose a creature type.

Vehicle creatures you control are the chosen creature type in addition to their other types.

Each creature you control of the chosen type other than this Vehicle gets +1/+1.

Crew 3

As Coalition Construct enters, choose a creature type.

Coalition Construct is the chosen type in addition to its other types.

When Coalition Construct enters, other creatures you control of the chosen type and creature cards of that type in your hand perpetually get +1/+1.

: The next face-down creature spell you cast this turn costs less to cast.

If turning a face-down permanent face up causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Changeling (This card is every creature type.)

As this creature enters, choose a creature type.

Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature.