Brisingamen

When Brisingamen enters the battlefield you
may give a creature you control a +1/+1 counter
and a creature that an opponent controls a -1/-1 counter
{t}: {w} give any creature a +1/+1 counter or -1/-1 counter, this artifact doesn't untap on your next
untap step
Brisingamen, the beautiful necklace of Freya, made
for her by the four dwarves Alfrigg, Berling, Dvalin,
and Grerr