No, They haven't. From MTG Top 8(I'm taking last 2 months, because the cards weren't printed until halfway through the year meaning numbers would be skewed more) Collective Brutality is played in 15.9% of top 8 decks to Selfless Spirit's 2.1%, Gideon Ally of Zendikar's 0.3%, and Spell Queller's 1.7%.
I understand that Bant Eldrazi is a fluke, but White is the only colour without a strong 2 Drop. Green has Goyf, Blue has Snapcaster, Red has Eidolon, and Black has Bob. All of these cards are non-legendary 2 Drops that promote a key part of what that color is, while White's stuck with Arbiter and Thalia as it's 2 Drops.
Bant is probably the biggest deck now that is 1/2 good cards away from being a great deck, and it's frustrating to see loving that color combo.