Corruption of Towashi: March of the Machine

When Corruption of Towashi enters the battlefield, incubate 4. (Create an Incubator token with four +1/+1 counters on it and "{2}: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.) Whenever a permanent you control transforms or a permanent enters the battlefield under your control transformed, you may draw a card. Do this only once each turn.