Elend, Haunted Piper

When Elend, Haunted Piper enters the
battlefield create a 1/1 black Rat creature token.
{b},{t} Create a 1/1 black Rat creature token.
{2}{b}{b},{t},, Sacrifice three Rats: Gain control of
target creature.
{2}{u}{u}, {t}, target rat gains +5/+5 until end of
turn