The effect allows players to evolve their Grass-type Pokmon on the same turn that they play
But more importantly, if being at 0 is what makes you lose, surely you want to stay as far away from that as possible
It combos with EDH staples like Lightning Greaves and can really slow down the tempo of a game
Enlightened Tutor specializes in allowing white to find artifacts or enchantments, adding consistency to any deck you put it in, whether that be an equipment deck, and enchantress deck, or a combo deck revolving around specific non-creature permanents
That said, those using Gyarados ex will find that the Pokemon has more HP and a higher-damage attack than the standard version of the sea creature, and thus, these decks have a much better chance of winning
That's a major reason to make my top Commander option here