Valeria, the Runecaster

{g}{u}{r}, {t}: Create a colorless Rune artifact token
with "This artifact doesn't untap during your
untap step", "{3}: Untap this artifact", and one of
the following: "{2}, {t}: Target creature can't be
blocked this turn"; or "{2}, {t}: Target creature
gets +2/+2 until end of turn"; or "{2}, {t}:
Whenever a creature blocks or becomes blocked
by target creature this turn, this artifact deals 1
damage to that creature and 1 damage to that
creature's controller."