Sai, Master Thopterist

Whenever you cast a spell with mana value 4 or greater, create a 1/1 colorless Thopter artifact creature token with flying.

Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying.

Whenever you draw your second card each turn, put a +1/+1 counter on this creature.

When this creature dies, create a 1/1 colorless Thopter artifact creature token with flying.

When this creature enters, create a 1/1 colorless Thopter artifact creature token with flying.

Flying (This creature can't be blocked except by creatures with flying or reach.)

When this creature enters, create a 1/1 colorless Thopter artifact creature token with flying.

Flying

Whenever you draw your second card each turn, create a 1/1 colorless Thopter artifact creature token with flying.

Crew 2