Helgi, Holy Valkyrie

Flying
Whenever a non-token creature you control dies
exile it with a Valhalla counter on it.
At the beginning of your upkeep if you control 5
or more creatures in exile with Valhalla counters,
draw a card.
Then if you control 10 or more creatures in exile
with Valhalla counters, you return all creatures
with Valhalla counters to the battlefield.