It can be particularly useful if youre in a deck that burns through its own life total (hello, Orzhov) or in strategies low on creatures to block with, as youll take a few hits on the way
The common Red drop 4/4 five-mana has an ETB trigger to keep two from blocking this turn, again, great with attacking for cards
Still, you get a 1/1 spirit each time, and when other creatures enter, too
These hit the battlefield untapped provided you control two or more lands, making them an ideal way to put options on the table for casting your best multicolor spells with no need to wait an additional turn or take two damage
But imagine something like Teachers Pest, Withering Curse, and this
(You can't use more than 1 GX attack in a game.) [P+] Aero Unit GX Attach 5 basic Energy cards from your discard pile to your Pokemon in any way you like