This is the Senfglas Reno Freeze Mage Deck w Anomalus that Senfglas used on stream to make it to legend this season (season 29 August 16).
It’s an interesting deck with a few more options than the typical Freeze Mage list. It does run Reno, however there are 7 duplicate cards in the deck. You will not need Reno in most games, but in the games that run long and you’ve drawn most of your deck it’s an extra win condition.
The most interesting card is Anomalus. This is the Mage legendary that included in the Whispers of the Old Gods expansion. It does 8 damage to all minions when it’s killed, which is a huge board clear that will almost certainly clear everything.
You play this deck out like most Freeze Mage decks. Draw and freeze or kill minions until you can Alexstraza your opponents face. Then burn then. It’s only really Warriors or Priest that armor up and heal a lot that really counter this deck.
Looks pretty tough doesn’t he? Deathrattle: Deal 8 damage to all minions. There aren’t many minions that will survive that fall-out.
It’s perfect in Freeze Mage for clearing the board. The only real hard counters are cards like Hex and Polymorph.