Doofus of the Fourth Floor

As an additional cost to cast Doofus of the Fourth Floor, pay {1} for each previous time Doofus has entered the battlefield.
First Strike
When Doofus enters the battlefield, search your library for a card named Chonky of the Fourth
Floor and put it into your hand.
If Doofus would receive lethal damage,
return Doofus to your hand.
Doofus has Double Strike as long as
you control Chonky of the Fourth Floor.