You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell
Combine that with the natural grindy powers of Jund, and you have yourself a Knight commander for the ages
Depending on the ingenuity of the Sharpie-holder, different cards can rise and fall in terms of power level, and new inside jokes can be forged
Like most Magic: The Gathering cards, the value of Wrecking Ball Arm depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Final Fantasy Commander)
The specificity makes it narrow, but the right deck could leverage this as an extra enchantress
From a flavor standpoint, it perfectly captures the classic cat versus rat conflict