Uoch, Ancient Chimera Den

When Uoch, Ancient Chimera Den enters or leaves the battlefield, create a 1/1 Changeling creature token of any color.
Sacrifice a creature: add {b} to your mana pool.
Sacrifice Uoch, Ancient Chimera Den: Create three 1/1 Changeling creature tokens of any color
The worst curses are the ones that get harder to break the longer you wait