Magic: The Gathering has provided a first look at the new cards, commanders, and more coming in its future Final Fantasy set
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
Making opponents choose between wasting resources, limiting their offensive, or attacking elsewhere.
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
Runners-Up: Underappreciated M:TG Cards for Any Format One With Nothing is a notorious card from the Champions of Kamigawa block, a cheap black instant that discards the player's entire hand