Off the top of my head, in Standard and Modern, it prevents some or all of the use of the following cards: Every flashback card (in particular) Ancient Grudge Desperate Ravings Dread Return Dream Twist Faithless Looting Forbidden Alchemy Mystical Teachings Past in Flames Think Twice Unburial Rites Snapcaster Mage Narcomoeba Reanimate Exhume Every undying creature Every persist creature Gravecrawler Ichorid Ashen Ghoul Proclamation of Rebirth Polymorph Probably quite a few others 1) Drogskol Captain Hexproof is a very non-interactive creature mechanic, making it one of the more powerful mechanics to have been printed in recent years
Could it be her popularity as a character
One of the problems with defenders as a tribe is that we really need to find our payoffs, especially Arcades and Wingmantle Chaplain, or else we have these awkward games where we play a bunch of zero-power defenders, make a bunch of mana, and don't really do anything with it
There, it states the playing card decks come in a set of Red and Green, and with a price of 1,000 yen (compared to the 500 yen for single decks)
Counterspell is often paired with smarmy flavour text of saying nope to your opponent, and this one manages to do it purely with the art