Breaching Hippocamp + Mana Echoes + Prismite + Saheeli, the Sun's Brilliance

UR identity

Commander legal

The 4 combo pieces

What must be in place

Saheeli does not have summoning sickness.
{U}{R} available, plus an additional {U}{R} if you control less than three creatures that share a creature type with Breaching Hippocamp

How to execute it

  1. Activate Saheeli by paying {U}{R} and tapping it, creating a token copy of Breaching Hippocamp with haste.
  2. When the token Breaching Hippocamp enters the battlefield, it and Mana Echoes trigger.
  3. Resolve the Breaching Hippocamp trigger, untapping Saheeli.
  4. Holding priority, if you control less than four creatures that share a creature type with Breaching Hippocamp, repeat steps 1 through 3 one additional time.
  5. Resolve all Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with Breaching Hippocamp for each trigger resolved this way.
  6. Activate Prismite twice by paying {4}, adding {U}{R}.
  7. Repeat.

What the combo produces