This deck involves exploiting High Justice Grimstone's legendary Millhouse Manastorm drop on Turn 1 for a Turn 2 kill. This deck is extremely flexible, and really only requires Sound the Bells! The rest of the cards are either minions that you can play on Turn 1 or spells that you can play on his Millhouse turn for extra draw or to clear off the 1/1 Taunt.
Mulligan strategy: You need one of your copies of Sound the Bells!, a one-drop minion, and some spell damage from hand. However, since the deck has plenty one-drops and spells that do damage, I would hard mulligan for Sound the Bells!
General strategy: Play a one-drop on Turn 1 (Lost in the Jungleis probably the best card for this as you won't technically need any spells that do damage with the extra Silver Hand Recruit). Restart the game if High Justice Grimstone does not play Millhouse Manastorm on Turn 1. On Turn 2, use Sound the Bells! to buff your minion to OTK potential. If he plays Millhouse and you don't have one of the Echo spells, you still have the potential as a large part of the deck cycles.