Kingdom Crasher

{u}{r}: Kingdom Crasher becomes a 3/3 Spirit with flying.
{u}{u}{r}{r}: If Kingdom Crasher is a Spirit, Kingdom Crasher becomes a 4/4 Spirit Harbinger with hexproof and flying.
{u}{u}{u}{u}{r}{r}{r}{r}: If Kingdom Crasher is a Spirit Harbinger, Kingdom Crasher becomes a 8/8 Spirit Harbinger Incarnation with hexproof, flying, and protection from instants and sorceries.