Elbrus, the Binding Blade / Withengar Unbound I don't recall seeing this card in action, either in Standard or after its rotation
For four mana, I can deal X damage to target creature or planeswalker, where X is the greatest power among creatures I control and if it would die this turn, I can exile it
Theres a few Azorius snow cards that tap your opponents creatures or prevent them from untapping, including Icebreaker Kraken, and you can supplement them with other tappers from WOE and other cards with icy or snow card art
I've gotten beaten down by enough Dragon's Rage Channelers and Ragavan, Nimble Pilferers lately that the idea of facing down a Deathrite Shaman almost sounds nice
Hayes In short, hexproof just means that a card can't be targeted by any spell or ability controlled by an opponent