Elemental Mastery + Encroaching Mycosynth + Steelfin Whale

UR identity

Commander legal

The 3 combo pieces

What must be in place

Elemental Mastery attached to Steelfin Whale.
Steelfin Whale does not have summoning sickness.

How to execute it

  1. Activate Steelfin Whale by tapping it, creating a 1/1 Elemental creature token.
  2. The Elemental enters the battlefield as an artifact due to Encroaching Mycosynth, triggering Steelfin Whale, untapping Steelfin Whale.
  3. Repeat.

What the combo produces