Sefi the Quiet

Whenever Sefi attacks, each opponent loses X life, where X
is the number of other attacking creatures.

Sacrifice another creature: You gain 2 life and draw a card.

"Ride to kin and enemy alike and tell them Sefi speaks. Tell them Ragnar’s prophets told true. Asgard has fallen. The gods are dead. The old oaths have been broken. And tell all who will hear: the Valkyrie ride to war."