Mjerrabaine, Omen of One

Exalted, Trample, Vigilance
Can block an extra creature each combat.
Can't be blocked by more than one creature.
When Mjerrabaine, Omen of One enters the
battlefield, if there are no duplicate cards in your
Library, you get an emblem with "At the end of
your turn, if you control only one creature, give
it +2/+2. Each opponent and one random
creature they control each take 2 damage."