Bident of Thassa, which is one of the best blue artifacts on top of being a legendary enchantment, provides an additional version of the effect plus a way to forcibly tap opposing creatures
Sometimes its best to leave a threat in play and by turning it into a flyer with deathtouch, and forcing it to attack your opponent each combat well that makes for quite a good aura
Youd rather have Aetherize in that last scenario, but Aetherize doesnt have other utility
Populate makes a copy of an existing token, letting you take that 1/1 copy and turning it into three, four, or even more of them with minimal work
It's effect is on-going, and you can build around it with artifact creatures or things you can't target (like Protection from Black) or indestructible stuff that can't be destroyed at all
Im just not blown away by it, given that Unnatural Growth exists and does the same exact thing