Mulligans
Your eggs are Devilsaur Egg, Mechano-Egg, and even though this is not a true egg Mechanical Whelp is used for the same purpose.
To activate Devilsaur Egg, used the buffs provided and Void Ripper.
Activating Mechano-Egg is a little bit easier, as you may use all the magnetic buffs on it. Bronze Gatekeeper is the best buff on this minion against aggro decks. Zilliax and Wargear are good in other mach ups.
I have added Damaged Stegotron to the deck because playing magnetic buffs on it is very good for reviving it from Kangor's Endless Army because as it turns out, reviving a 8/14 Taunt, Divine Shield, Lifesteal, and Rush minion is not too bad.
Replacements:
Kangor's Endless Army > there is no real replacement but i guess Tirion Fordring is the best you can get.