Dimentio

All creatures in your library perpetually gain haste
All creatures in your library
perpetually gain Unearth {2}
When you unearth a creature, its an artifact
along with its other creature types
{2} Sacrifice an artifact; put a void counter on Dimentio
When Dimentio reaches 5 void counters, exile Dimentio and one target creature then return Dimentio transformed under his owners control