Mirrorweave

Nacatl War-Pride and this thing... Ouch. I can get a huge number of tokens pretty fast in my deck. When all of those turn into Nacatl War-Pride, then those all turn into a number of themselves equal to the number of creatures defending player controls... You''re looking at more than 100 extra damage in my experience. It''s a cat based Nuclear Apocalypse.

Great card... runs like a boss in soldiers and winnies decks, mirror any auriok stellshaper to make your soldiers bigger than enemies (you equipments will become very flexible at this point!), or mirror a token to make a great dispensable block, mirror a big creature on the field to have thousand of it in your side, mirror a jotün grunt or any cumulative upkeep creature to take off your enemies, mirror a deftblade elite and LOL like a madman! HAHAHA!!
Any blue/white deck may have at least two!

....just copy cenns heir and thats it..... pure white creature power..... cause its ability to pump will be trigger if you attack , and your opponents copy will remain 1/1 and they cant do anything about it......

...this card is totally perfect for kithkin deck...PERIOD....

shocked that my review is first. this card is great in all formarts... smash it.

Lolz with Biovisionary. Great for token/weenie decks, kinda like a {W/U} version of Overrun.

mirror-sigil sergant or lumionous angel right before your upkeep and with paradox haze out lots of creatures

It is definitely a weird card at first glance and possibly another junk because of its "all creatures" and "non-legendary" spell text. :(
Look at it closer and you see it as a potentially a semi-bomb...as long as you have more creatures than you opponent:) so don't get a shock when you see a t2 kithkin deck running it.
Supposdely, aggro kithkin decks ditch this card due to its 'slowness' but really in tournaments its pretty dangerous as a counter-bomb when your opponent runs e.g. u/b fairies. Played it on a scion of oona and opp. got killed 1 shot KO!:). Still, it has a bit of an element of control in it as it acts as a deterrent to play targetable creatures as well as a incentive to spam creatures.