Liliana's Agonizer

Spirits can't be blocked except by Spirits.
Whenever a Zombie, Skeleton or Horror you
control dies or is put into a graveyard from
your library, if it wasn't already a spirit, put
it to the battlefield under your control and it
becomes a spirit in addition to its other types.
{b}{b}: Exile target creature you control, Then
return it to the battlefield. It gains haste until
end of turn.