I've tried Cordi's and numerous variations of the corner base....including the ones that have been used to beat T5. However, this definitely abuses pathing unlike any other base.
It requires TH20 to build it like the pictures I'm posting, but can be built with TH19. I have an arrow tower at the bottom to avoid wave timeouts from remaining troops from a santa proc. If you do not want to run santa or own him, he can be subbed by other heroes with great success.
My hero arrangement usually is :
I suggest using revive crests if you are trying to push content you haven't got on farm yet. I haven't named the base because I'm not a lame like InstantKarma.....just sharing for the CC Community. Enjoy !!