Great Whale + Saheeli, the Sun's Brilliance + Umbral Mantle

UR identity

Commander legal

The 3 combo pieces

What must be in place

Umbral Mantle attached to Saheeli.
Saheeli does not have summoning sickness.
You control up to seven lands that can tap to produce at least {3}{U}{R}.

How to execute it

  1. Activate up to seven lands by tapping them, adding at least {3}{U}{R}.
  2. Activate Saheeli by paying {U}{R} and tapping it, creating a token copy of Great Whale with haste.
  3. When the token Great Whale enters the battlefield, it triggers, untapping up to seven lands.
  4. Repeat.
  5. If you control up to seven lands that can tap to produce at least {4}{U}{R}, this combo nets infinite mana, and you may target any other creature(s) or artifact(s) using Saheeli's ability.

What the combo produces