Boromir, Willing to Sacrifice

Unify 4 - First Strike, Ward {2} (If you control 4
or more creatures, all creatures you control gains
First Strike and Ward {2}.)
If a creature would die, instead you may prevent
that damage and put a -1/-1 counter on Boromir, Willing to Sacrifice.
Whenever Boromir, Willing to Sacrifice dies, ret-
urn it to the battlefield transformed under your control