Mechanized Ninja Cavalry

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When this Siege enters, 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. (A creature with flying can't be blocked except by creatures with flying or reach.)

When this creature dies, create a 1/1 colorless Soldier artifact creature token.

When this artifact enters, you may discard a card. If you do, draw two cards.

, Sacrifice this artifact: Create a tapped 2/2 colorless Robot artifact creature token.

When this creature enters, you get (three energy counters).

Pay : Create a 1/1 colorless Thopter artifact creature token with flying.

When this artifact enters, create two 1/1 colorless Gnome artifact creature tokens.

, Sacrifice this artifact: You gain 3 life.