Thran Temporal Gateway

Oracle Text
, : You may put a historic permanent card from your hand onto the battlefield. (Artifacts, legendaries, and Sagas are historic.)
Card Rulings
4/27/2018 A card, spell, or permanent is historic if it has the legendary supertype, the artifact card type, or the Saga subtype. Having two of those qualities doesn’t make an object more historic than another or provide an additional bonus—an object either is historic or it isn’t.
I think needing to have the bomb card in your hand instead of pulling from your library makes it a little worse. Sure, you don't fail spin to wins, but you also have to have it. The lack of a cast trigger means it probably won't see much Modern play, but Marvel hasn't exactly either.
All that said, you can still put into play some great permanents in Standard. It should prove to be a fun card to build with. I'll almost certainly try it as a one-of at some point.
srsly tho wtf were they thinking? combine this with 1 manaramp and we have any titan on turn 4.
turn one forest
turn 2 forest and llanowar
turn 3 forest plus this thing
turn 4 play any OP creature you want. remember if it's strong and Op it's probably legendary.