William Birkin, G-Virus Form 3

First Strike, Deathtouch, Rampage 2
Other Human creatures you control get +1/+1
and Rampage 2.
Human creature spells you cast cost {1} less to cast.
When William Birkin, G-Virus Form 3 dies, you may search your hand, graveyard, or library for William Birkin, G-Virus Form 4 and put it onto the battlefield tapped without paying it's mana cost.