The only stand alone cards in this element that work well in a mono
deck are Hourglass, Procrastination, Reverse Time, Precognition, its Dragon and Pharao. All of the other cards require the presence of other elements in the deck to work properly as they are meant to be. For instance Anubis needs
to activate his special skill, Sundial becomes more effective with
, GotP is designed to work with
(Nightmare) although it's a decent creature by itself, Dune Scorpion is useless without buffs and so on... therefore I consider time as a support element, meant to work in a multi-element deck.
As a mono, Time is not particularly strong, at the contrary of other elements like Aether, Darkness or Life, thus it's hard to tell against which it works well. As the others have wrote already, Time's nemesis seems to be Aether, but beside that it supports well any strategy against any other element. By standing alone its only real strength is the stalling power given by Eternity, Sundial, Reverse Time and Procrastination.
That's my opinion. Does the Master of Time agrees with me?