Death of the World

Kicker {2}
Destroy target creature with power 4 or less. Exile that creature next turn. Put a -1/-1 token on target creature with power 5 or greater. Do the same the following turns until that creature dies. When that creature dies, exile it instead.
If this spell was kicked, exile a creature with power 3 or less. Return them to their owners hand after two turns in exile.