Hearthpwn

i found a really fitting package to my friend Genn Greymane in wild

2 Drops

its amazangly working together: the 2 mana Call to Arms targets are amazing mech's starting with the universal Shielded Minibot , Annoy-o-Tron , its good to call down an evergowing Micro Machine especially behind taunts.

4 Drops

because turn 3 is sometimes problematic because 2 drop and hero power not powerful enough?Mechwarper come to be your aid! curve your Piloted Shredder one turn earlier, also Arcane Nullifier X-21 and gorillabot are great targets, and when you run out of gas Jeeves come handy too. 

6 Drops

not many 6 drops, (only genn and Sunkeeper Tarim as sometimes the finisher), make the deck really consistent, personally my favourite genn deck,

the key is not focusing on your hero power, let the mechs do the work for you!