Magda, Brazen Outlaw, Arcane Adaptation, and Tidewater Minion

Prerequisites

• Magda, Brazen Outlaw on the battlefield
• Arcane Adaptation on the battlefield
• Tidewater Minion on the battlefield
• Tidewater Minion does not have summoning sickness
• Arcane Adaptation on the battlefield with "Dwarf" chosen

Steps

1. Activate Tidewater Minion by tapping it, targeting itself
2. Magda triggers, creating a Treasure token
3. Resolve the Tidewater Minion ability, untapping it
4. Repeat

Results

• Infinite colored mana
• Infinite Treasure tokens
• Put all Dragon and artifact cards from your library onto the battlefield