Its never been harder to be a Pokmon TCG collector
Attaching this aura to a powerful creature can easily help take out large threats on an enemy's board, or even finish out a game if the opponent is low enough on life
3 mana for a 3 loyalty planeswalker is also an excellent rate, allowing you to play Aminatou early for access to an extra card in a pinch, providing easy setup of an inexpensive permanent with a relevant ETB ability and Aminatou on the same turn, or simply letting you play Aminatou late with mana up to protect it from countermagic or removal
That seems like a lot but remember that studies show there are currently 40-million people around the world that play and collect Magic: The Gathering so thats less than a pack per person in todays numbers
If youre in WB colors, then Lotho, Corrupt Shirriff is a really great way to make mana
If you answered yes to any of these questions, pull up a log and lemme plant some seeds in your head