Ominous Obelisk

Ominous Obelisk enters the battlefield with X omen counters on it if you didn't cast if from
your hand, where X is the number of creatures
you control.
{t}, Tap X untapped creature you control: Put X omen counters on Ominous Obelisk.
{t}, Remove X omen counters from Ominous Obelisk: Create X 1/1 green Elf creature tokens and draw X cards.