Mercurial, the Spectre

Shadow
{4}{u}{b}, Return Mercurial, the Spectre to its
owner's hand: For each nontoken creature your opponents control, create a 2/2 colorless Spirit creature token named Spectral Nemesis with
shadow.
{2}, Exile a creature you control named Spectral Nemesis: Put Mercurial, the spectre from your
hand onto the battlefield.