Slifer the Sky Dragon

Indestructible, Flying
This Spell can not be countered.
When Slifer the Sky Dragon is summoned,
sacrifice 3 creatures you Control. Silfers Power
and Toughness are equal to the number of cards
in your Hand plus one.
Whenever an opponent casts a creature spell, the summoned creature permanently gets -4/-2. If
the Power or Toughness of a creature is
reduced to 0 by this effect, exile that creature.