1 2 "MTG Basics: Competitive formats"
While flicker decks have historically been better for adding blue, its now increasingly possible to get away without doing so
This means that Oblivion Rings shut down your modular creatures and you wont be able to Cloudshift those modular creatures off the battlefield to move their counters while returning them at full strength
fatties like Avenger of Zendikar, Sun Titan, or Avacyn, Angel of Hope)
I actually think it was smart to broaden its appeal outside of Assassin typal decks, because otherwise these cards would not see much play at all
Throw in Witch's Clinic, Hedgewitch's Mask, Witch's Vengeance, and Witch's Cottage for some variety in your spell and card types and youre set