MTGNexus

I think this deck is cute as a Gruul only list, but lately I feel like I have to add black. Heartless Summoning combos with Sparkcaster and Morophon, tutors and card draw make sense for a combo deck, and cards like Golgari Charm, Assassin's Trophy, and Opposition Agent are great to play for a competitive deck.

What do you guys think?

I don't see many Kavu? Aluren is decent for combo but a little pricey.

I think I need to add black to the deck. It's cute as primarily just a Gruul list, but Heartless Summoning goes infinite with Sparkcaster and Morophon, the Boundless, Demonic Tutor and Vampiric Tutor make sense for a combo deck, plus black has lots of great card draw in Black Market Connections, Stinging Study, Night's Whisper, removal in Assassin's Trophy, and my favorite charm in Golgari Charm, that can protect the combo, wipe the board against aggro, or remove an enchantment. Something like:

Decided to go back to a Gruul list. It's more on theme for Kavu, it's funnier to have the deck be 99% Gruul for Morophon, and I think it works as a Gruul list.