Enigma + Luna

Why this works

A successful Black Hole creates the perfect situation for Luna to deal her damage. While enemies are trapped, her Eclipse can strike the same few targets repeatedly, and her Moon Glaives bounce between the clustered heroes for maximum effect. This classic teamfight combo is the entire basis for picking these two heroes together. Outside of that specific interaction, Enigma doesn't do much to accelerate Luna’s farm or protect her in lane, so the game plan is built entirely around landing that one big ultimate pairing.

This combination lives and dies on execution. Both heroes rely on long cooldowns, and Enigma absolutely needs a Blink Dagger to initiate effectively. The whole plan is very predictable from the draft, so smart opponents will focus on finding ways to cancel Black Hole from a distance or will simply refuse to group up. If that one big fight goes wrong, or if the key ultimates are on cooldown, the heroes don't offer each other much fallback synergy, making the outcome of any given game feel very dependent on a few crucial moments.