The ability to reuse any low CMC permanent opens the way to abuse with cards like Animate Dead, Necromancy, and Dance of the Dead while still letting you reuse Sakura-Tribe Elder and other efficient utility creatures
You can potentially offset this complexity by running Far Traveler as a Background, but then you lose out on access to a second color for what amounts to a worse version of what Brago, King Eternal can do
Creating additional copies of equipment, Firion can essentially grant free, temporary buffs to creatures when paired with the right equipment
I know its Standard-legal, but its very clearly aimed at EDH
9 Hexavus Too Many Counters To Count There are quite a few ways to get those pesky finality counters out of the way, and with Hexavus, you can spread the love a bit with two different abilities