I'm glad that you liked the post. Hopefully the combo works for you as well.
One thing I might add is that Obsidian is likely the biggest threat due to the high magic damage potential. Unicorn Mustang with most healers has the potential to deal at five damage per round and you the Elder won't be able to defeat the opponent. This means that you need a bit of luck with the Mustang missing it's attacks until round 20 when fatigue sets in. A Slipspawn, Goblin Psychic and obsidian will put out six magic damage per round and can be played if 19 mana is available. It is not often you will run into these specific combinations, especially in lower mana games.
I might edit the post and included this information once I have the RCs needed to do so.