Gribble, the Mutator

Other Mutants you control gain deathtouch.
{1}{u}{g}{t}; Sacrifice two non-token creatures;
create a mutant with all creature types, colors,
and abilities of the sacrificed creatures, with
power equal to the sacrificed creatures combined
power and toughness equal to the sacrificed
creatures combined toughness, its a mutant in
addition to its other types.
"With his powers, two merge into one."