The Siege Perilous

{2},{t}, Sacrifice two untapped creatures you
control. Put target creature power with X or less
into play, where X equals the combined power of
the crestures sacrificed to activate this ability.
Fuse type creatures you control get +1/+1 and
have regenerate {2}.
Sometimes it grants a chance at a new life, other times
it grants a new life a chance. — Siege Perilous studies