Because you get to choose two modes, its hard to go wrong with this spell
Liliana will be a solid grab when she bottoms out
Normally in Magic , we're trained to wait and use our instant-speed removal spells at the last possible moment to gain more information, but this strategy often leads to disaster against Infect, since they have a bunch of cheap spells that can fizzle targeted removal (Blossoming Defense, Vines of Vastwood, Apostle's Blessing)
The Misty trainer card is one of the best cards in the meta, but it does come with quite a risk
Similarly to Panharmonicon (another do-nothing artifact that forces you to take off your fourth turn), to make Thran Temporal Gateway work, it has to be so powerful that it catches you back up after putting you behind