Calcifying Nimbus

Flash
Enchant Creature

Enchanted creature has lurch and "{7}: untap this
creature." (A permanent with lurch does not untap
during its controller's untap step)

If a creature enters under an opponent's control and
it was not cast from their hand you may pay {w}. If
you do, create a copy of Calcifying Nimbus and attach it to that creature.