Perhaps people think that because it needs Energy to reanimate that it doesn't just kill small swarms without any effort at all
This is basically the same effect as untapping Gilder Bairn but applied to everyone, and blinkable
It has a bit of a Sram's Expertise feel to it with the return it offers and the ways in which both can effectively cost less mana
First, it is an exile effect, and exiling all nonland permanents frequently costs more and has more white pips, such as with Planar CleansingPlanar Cleansing
While the previous card brought in the theme of not being able to block, this also has a common ability in coming into play tapped, which has also been used multiple times in the latter cards
When Nicol Bolas, the Ravager enters the battlefield, each opponent discards a card