Morpheus's Dreamworld

{u}: Target creature becomes a chosen creature type until end of turn.
{3}{u}: All creatures become a chosen creature type until end of turn.
{3}{u}{u}{u}: All creatures become all creature types until end of turn.
During your upkeep, put a time counter on this card. When three time counters are on it, remove them and create a 0/1 changeling enchantment-creature token. When this card is removed from play, remove all changelings created in this way.