Wyrdhorn

This card costs {1} less for every turn you have had in this game. This card costs {1} more for every health point you have above your starting total. If you
have no creatures, this card costs {1} less for every creature
your opponents control.
Summon X planeswalkers to the field from anywhere,under the control of any player you want. They have two extra loyalty counters on them.
They can be sacrificed for ten life.