Earthcraft, Bootleggers' Stash, and Steelfin Whale

Prerequisites

• Earthcraft on the battlefield
• Bootleggers' Stash on the battlefield
• Steelfin Whale on the battlefield
• You control a basic land

Steps

1. Activate a basic land by tapping it, creating a Treasure token
2. The Treasure enters the battlefield, triggering Steelfin Whale, untapping Steelfin Whale
3. Activate Earthcraft by tapping Steelfin Whale, untapping the basic land
4. Repeat

Results

• Infinite colored mana
• Infinite Treasure tokens