Ominous End

Trample, infect, indestructible
Ominous End enters the battlefield with X +1/+1 counters on it. When it enters, opponents may pay any amount of mana.
If they do they create an artifact named
Delay the End, then place time counters on
it, and +1/+1 counters on Ominous End,
equal to the amount of mana they pay.