Elemental Mastery + Steelfin Whale + Encroaching Mycosynth

Elemental Mastery

Steelfin Whale

Encroaching Mycosynth

How it works

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.

By enchanting Steelfin Whale with Elemental Mastery, you turn the whale into a tap-to-produce-horde engine whose output scales directly with its power. The true magic lies in Encroaching Mycosynth, which redefines every nonland permanent—including the very Elemental creature tokens you are generating—as an artifact. This clever type-shift ensures that each new token entering the battlefield immediately satisfies Steelfin Whale's untap trigger, making the whale ready to tap again for another wave.