Epoch's Entailment

Epoch's Entailment is Hexproof. When Epoch's Entailment enters the battlefield, put XX time counters on it. At the beginning of your upkeep, remove Y-2 time counters from Epoch's Entailment where Y is the number of artifacts you control. At the beginning of your upkeep, put Z time counters on Epoch's Entailment where Z is 2 if Y is -2 and Z is 1 if Y
is -1. Otherwise, Z is 0. When there are no time counters on Epoch's Entailment, sacrifice Epoch's Entailment. Take X extra turns after this one.