Though you will most often cast the god half of Valki, God of Lies, we'll still have the ability to summon Tibalt, Cosmic Impostor. Even if our second pack isn't Red, we have Thriving Moor and a very thematic Burnt Offering. If we sacrifice, say, a morphed creature we have three Red right there and can hope to bring forth the devilish Planeswalker from the ashes as soon as turn five.
Rather than trying to synergize with the ability of our trickster god, we're appeasing him with tricky cards. Morph creatures will keep your opponent guessing. Is it a Haunted Cadaver, which will rot their mind if unblocked? Is that innocuous 2/2 a Zombie Cutthroat, which could win a combat even when we're tapped out? Is that mysterious being a Skinthinner, which will jump-scare one of their creatures to death? Or is it something even more ominous?
If an opponent tries to kill one of your devotees, you can sacrifice it to morph Gift of Doom. This unwholesome blessing may well have been bestowed by the god Valki himself. A battlefield full of morphs will unsettle your foe. They will have difficulty deploying removal, and you will have the flexibility of commanding both early plays as well as late game fatties like Marsh Hulk.
You may have noticed this pack has an additional ninth land, Zoetic Cavern. This sneaky morph can turn into a land if blocked by a bigger creature or targeted with removal. That's fun to imagine, but two other scenarios are more likely. First, you play it as a colorless land because you want to hit all your land drops with morph. In the Tarkir block we would often register eighteen or even nineteen lands. Second, if you are flooding, you can deploy Zoetic Cavern as a Gray Ogre.