The potential to activate it multiple times a turn lets you get really far ahead, and it does all the planeswalker things provides board presence, card advantage, and removal in a single card
Similarly, Vanishing cards like Aven Riftwatcher were introduced in Time Spiral block, which featured Planar Chaos and Future Sight alongside Time Spiral
Brave the Elements can even help your creatures shed auras like Darksteel Mutation or Shiny Impetus or to turn your own board into a wall of defenders that can survive combat when an opponent swings into you to force you to trade creatures or take big damage
Deathrite Shaman maybe
This is by no means the strongest Commander strategy out there, but it is very easy to upgrade this deck into a menace with just a few cheap pieces
Going wide works well for some decks, but for LotR: Tales of Middle-Earth , the Amass effect is more fitting