Vintage kept its restricted list, because some people wanted to play with powerful cards (and also because Type 1.5, aka legacy had started to take root, which, at the time, was just vintage with the restricted list renamed "banned list"), but in standard, you already couldn't play with all your cards, so there really wasn't any good reason to keep a restricted list
They can be solved fairly easily, and, unless combined with the other half of their combos (proliferation of counters, Mycosynth Lattice, Wheel of Fortune), dont have a huge impact on the game for more than a couple of turns
This will be the chase card of the set, with its sheer presence and shiny beauty likely to be very coveted by Avatar and MTG fans alike
Making opponents choose between wasting resources, limiting their offensive, or attacking elsewhere.
An ideal jumping-off point for those who didn't buy in from the beginning