3 Combat Celebrant One For All, All 4/1 Combat Celebrant was deliberately designed not to produce infinite combat loops, but it turns out you can just make copies of Celebrant and exert those instead to set up as many combat steps as you need
You can use the legendary creature to get around timing restrictions with your spells, drawing cards on your opponents turn to get chances to play cheap enchantments out on your opponents turn
Aang, at the Crossroads / Aang, Destined Savior Cards that care about land creatures aren't the strongest due to a lack of support
This will not only let you get multiple uses out of Giant Cobra, it will also keep your hand well-stocked, giving you lots of cards to discard to the Mysterious Advantage ability for tasty, tasty, game-winning lore
The amount of incidental Powerstone Tokens, Unearth Creatures, and resurrection play very well with Blacks sacrifice elements that are especially pronounced in Black/Red decks