Steelfin Whale, and Banishing Knack

Prerequisites

• Steelfin Whale on the battlefield
• Banishing Knack in hand
• available

Steps

1. Cast Banishing Knack by paying , giving Steelfin Whale an activated ability until end of turn
2. Activate Steelfin Whale by tapping it, returning the free artifact from the battlefield to your hand
3. Cast that artifact by paying
4. When that artifact enters the battlefield, it triggers Steelfin Whale, untapping it
5. Repeat from step 2

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite creature ETB
• Infinite creature LTB
• Infinite storm count