Teferi, Time Raveler not only prevents your opponent from interacting with your Dwarf or countering your Polymorph, but it also gives you the ability to cast Polymorph on your opponents end step and dodge a lot of the potential sorcery speed answers to Emrakul, the Aeons Torn
Leyline of Sanctity Leyline of Sanctity seems like the least fun of the Leylines in my opinion
Pair Charmander with consistent Fire energy acceleration so you can evolve fast and hit harder
Difficult, but Awesome: His main gimmick severly limits the number of cards he can hold at once, but thanks to his flexible statline and Survivor's abilities to interact with the discard pile, George can still be a very effective Investigator, having the option to gain back cards beneath him thanks to his signature (of which, unlike other Investigators, gets 3 copies of) and always having something ready to commit by sacrificing cards beneath his sheet to make space and replace them with others
That means you get to cast that instant or sorcery during your upkeep every turn