Ice-covered Clock of Kerindar

Whenever a player plays three or more instant or sorcery spells each turn, put a freeze counter on Ice-Covered Clock of Kerindar.
As long as there is a freeze counter on this artifact, players skip their untap step, creatures
can't attack or block, and activated abilities of other nonland permanents can't be activated.
At the beginning of your upkeep, pay {u} or remove a freeze counter from this artifact.