Os'nath, Born from the Inferno

Os'nath, Born from the Inferno's power and toughness are equal to the number of lands on the battlefield.
Decoy (Whenever a creature named Os'nath, Born from the Inferno is blocked, put a 5/5 red Demon creature token named Os'nath, Born from the Inferno onto the battlefield tapped and attacking.)
Whenever Os'nath, Born from the Inferno attacks, exile cards from the top of your library equal to the number of +1/+1 counters on it.