Koh, the Face-Stealer is a big 2-for-1 with a bizarre activated ability
If you want to get really spicy with this card, pair it with Spurnmage Advocate for the a play that the whole table will remember
TLDR MTG fetch lands trade 1 life (and some shuffling) to fix your colors, fuel synergies, and make greedy mana bases actually function
Aang, at the Crossroads's delayed triggered ability won't cause it to transform back into Aang, at the Crossroads if it has already transformed into Aang, Destined Savior, perhaps because several creatures left the battlefield in one turn
This is especially true because Red has so much treasure
So, the tricky thing here is that youre basically never going to play Acererak on turn three, like one wants to do