Firna, Destroyers' Allys

When Firna, Destroyers' Ally enters the battlefield, you may sacrifice 5 permanents. if you
do, look for a Plainswalker named Vupinne, the destroyer.
When Firna, Destroyers' Ally enters the battlefield, create a 0/0 fox horror creature
token with "Haste, When this creature dies,
deal damage equal to this creature's power to any target" with X +1/+1 counters on it.