Nightmare Clock Tower

{t}: Add {1}.
{t}, {2}: Put a “Time” marker on Nightmare Clock Tower. If it has three or more, you may cast up to two artifact cards from your graveyard or exile this turn without paying their mana costs and gain "tap this card and untap target artifact".

The first time it reaches exactly three “Time” markers, create a 0/0 artifact creature token “Echo of the Nightmare” with Reach and Construct.