The ability to tap this creature, pay two mana and nine life into an Expropriate (the first example we can think of right off the bat, forgive us!), and then still have mana for other spells is absolutely massive , and honestly, while we are definitely going to play it, we dread seeing it cast on an opposing turn while free of removal spells to deal with it before it can be used even once
For a single mana, Berserk doubles a creature's power and provides them with trample, allowing you to potentially force massive sums of damage into an opponent
Like a true red deck, Animated Army incentivizes playing it aggro but your elementals only activating on your turn makes you particularly vulnerable to returned attacks
This is also one of the cards that I do not wish to see when I was playing
The art by Harold McNeill is detailed, yet it leaves something to the imagination, as well