Selzyne Reciprocal

When Selzyne Reciprocal enters the battlefield,
look at target opponent's hand and choose a
creature card from it. Selzyne Reciprocal
becomes a copy of that creature, except it's a
Mutant in addition to its other types, and isn't legendary if the chosen creature is legendary.
Ameliorate {2}{u}{g}(Sacrifice this creature. Search
your library for a creature with converted mana cost
equal to 1 plus this creature's CMC, put it onto the battlefield, then shuffle your libary.)