The Marmota

The Marmota enters with X shield counters and
you get X {e}. If X is zero, sacrifice The Marmota.

When The Marmota attacks each opponent sacrifices a permanent for each shield counter on it.

Pay X {e}: Destroy each nonland permanent you
don't control with mana value X or less.

Pay 8 life: Crew The Marmota. You get {e}.
Crew 6