Lurebound Scarecrow

As this artifact enters, choose a color.

Creatures you control of the chosen color get +1/+0.

: Add one mana of the chosen color.

When this creature enters, sacrifice a permanent that's one or more colors.

As Hall of Triumph enters, choose a color.

Creatures you control of the chosen color get +1/+1.

Vigilance (Attacking doesn't cause this creature to tap.)

As this creature enters, choose a color.

Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature.

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.

As this artifact enters, choose a creature type.

Creatures you control of the chosen type get +1/+1.

: Add one mana of any color.