Grave and Inferno Titan were ridiculously strong, you're going to want to splash for them in almost every deck you end up constructing because they're such powerful finishers. I cut them both a long while back due to how uninteractive they were. Prime Time is fair and a great payoff target for ramp that can get nutty with the ULD if you run it. Frost Titan and Sun Titan are on the lowest tier and neither are interesting enough for me to really want to cube with. Sun Titan is just a big dumb dude bringing back 3s, Frost Titan is just a big dude that freezes stuff. I like the effects and all, but stapled onto sizable 6/6 bodies with a splashy cost just turns me off to them.
Prime Time is the only one that hits the sweet spot of being strong and interesting enough for me to cube with, and that is mostly because of the ULD where you can pick up some sweet stuff.
Prime Time is the only one that hits the sweet spot of being strong and interesting enough for me to cube with, and that is mostly because of the ULD where you can pick up some sweet stuff.