War Factory

•{t}{p/r}{4} Create a 3/3 war machine artifact
creature token with trample. If you paid for this ability with 2 life instead of a red mana, create a colourless Bomb artifact token (See card: Glop, Frenzied Arsonist).•{t}{c}{4}{x} Create {x}
colourless Bomb artifact token. If {x} was paid for
with more than 2 mana, create a 3/3 war machine artifact creature token with trample. {3} Sacrifice
3 War Machine tokens: Return War Factory from exile to your hand.