Since you can repeatedly attach it to new creatures during your turn, forcing your opponents to attack with either their strongest creatures or with creatures they want to keep
This card is a changeling lord of sorts, and most EDH typal decks should run one, especially creature types with little typal support or those that create a bunch of tokens
Unlike things like Doom Blade, it can destroy them all, and it's a fun, cheap on the market, non-plussed way to start my list
Her +1 is in my opinion her best ability, regularly saving you mana on equip costs while giving you bodies, and you can use the other two abilities as needed
Ready for my favorite cycles of all time
The only drawback to having a creature like Nyxborn Colossus running rampant when creatures were proportionally weaker is that with seven toughness it would have been nearly unstoppable