Great Oak Guardian + Mana Echoes + Saheeli, the Sun's Brilliance + Signpost Scarecrow

GUR 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 Great Oak Guardian

How to execute it

  1. Activate Saheeli by paying {U}{R} and tapping it, creating a token copy of Great Oak Guardian with haste.
  2. When the token Great Oak Guardian enters the battlefield, it and Mana Echoes trigger.
  3. Resolve the Great Oak Guardian trigger, untapping all creatures you control and giving them +2/+2 until end of turn.
  4. Holding priority, if you control less than four creatures that share a creature type with Great Oak Guardian, 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 Great Oak Guardian for each trigger resolved this way.
  6. Activate Signpost Scarecrow twice by paying {4}, adding {U}{R}.
  7. Repeat.

What the combo produces