Geralt of Rivia

Partner with Yennefer of Vengerberg
Whenever a creature enters the battlefield under
an opponent's control you may have Geralt fight
that creature. When that creature dies this turn
put a number of +1/+1 counters on Geralt equal
to that creature's toughness.
"There is never a second opportunity to make a
first impression." -Geralt of Rivia