They have some abilities that Ready their characters, so Mulan Charging Ahead will be very useful Unfortunately, they also have a couple of very effective strategies against your Challenger-focused deck
The End Phase I hate that this set is coming out after DMU had barely just finished up and it feels pretty overwhelming in terms of product, but it's been like this forever now at this point
Even with 38 lands and 8 mana rocks, Grixis decks struggle to cast those 8+ mana spells, and this deck is chock-full of spells that cost 6 or more mana to cast
I was amazed when Midnight Guard came out in Dark Ascension , as it provides a repeatable trigger, for no mana, that can be abused for a variety of effects depending on what types of Auras we put on it
Lady Octopus, Inspired Inventor reminds me of Jhoira, Ageless Innovator
It's also one of the best counters against the Red Card, letting you protect your hand against it by dumping your important stuff the moment you see it in the enemy's hand