Koloktos, Ancient Automaton

Koloktos, Ancient Automaton enters the
battlefield with five Time Counters on it. At the
beginning of your upkeep, remove a Time
Counter from Koloktos, Ancient Automaton.
Whenever you equip a creature, remove a Time
Counter from Koloktos, Ancient Automaton.
At the beginning of your end step, if Koloktos,
Ancient Automaton has no Time Counters on it,
it deals 3 damage to all creatures your opponents
control.