I love Antonidas. He's one of those cards that usually either results in your opponent having an answer for (Sylvanas, Polymorph, Hex, Rag, lots of bodies to throw at him, etc) or immediately conceding. The only thing I love more than having your opponent immediately concede when you plop down Antonidas and they can't respond is to have them actually try to play it out (because they have lots of cards or maybe they can draw an answer or they think their life total is just too high too lose) while you just demolish their board with an endless rain of fireballs while Antonidas shouts "Ah-ha!"
Just had a really drawn our Jeeves Mage game where I finally drew my Antonidas with 10 mana and 2 Ice Lances. It ended 2 turns later, but the Antonidas beat down was too enjoyable.