Color identity, which owes its origins to the fertile mind of former Rules Manager Matt Tabak, sprung from the fact that Memnarch, along with Bosh, Iron Golem
In combination with the numerous undying creatures of the format, this makes for a solid game plan that can be delivered consistently
In Timey Wimey, it's a permanent source of time counters, for cards that care about that
That's a lot of support for an archetype, Liberator, Urza's Battlethopter is probably the strongest of the 3, but this lets you dump out Eldrazi on your opponents end step and then attack immediately, which is pretty dangerous
Dig Through Time is a more powerful effect than Fact or Fiction, it is castable faster and usually leaves you more mana spare to do other things with as well
Right now aggressive decks with Pikachu ex are dominating with their fast and hard hitting gameplay while control players are using Supporters like Sabrina to disrupt their opponents