Displacer Kitten + Great Whale + Mourning

UB identity

Commander legal

The 3 combo pieces

What must be in place

You control up to seven lands that can tap to produce at least {1}{B}{B}.

How to execute it

  1. Activate up to seven lands you control by tapping them, adding at least {1}{B}{B}.
  2. Cast Mourning by paying its mana cost, targeting Displacer Kitten
  3. Displacer Kitten triggers, blinking Great Whale.
  4. When Great Whale enters the battlefield, it triggers, untapping up to seven lands.
  5. Resolve the Mourning spell.
  6. Activate Mourning by paying {B}, returning it from the battlefield to your hand.
  7. Repeat.

What the combo produces