It also blanks indestructible, so depending on the current meta, this card can see a lot of Standard play, at least
The important line is at the bottom there, the third ability: 4, T: Copy target permanent spell you control (the copy becomes a token.) This might not be new new rules it might be that this was a lurking clause in the comprehensive rules at some point, not brought forward or presented obviously in some rules card or whatever
Besides crushing Burn, Collective Brutality also helps against Collected Company decks by taking out a mana creature and the Collected Company in their hand
In addition to the rainbow foiling, the card also features the artists signature in white on the cards art
The card is basically a big, hasty dragon that can help your other creatures do a good dragon impression after it dies
After all, are not all the best artifacts always ancient and powerful, valuable beyond measure with origins lost in the sands of time