Magda, Brazen Outlaw, Tidewater Minion, and Maskwood Nexus

Prerequisites

• Magda, Brazen Outlaw on the battlefield
• Tidewater Minion on the battlefield
• Maskwood Nexus on the battlefield
• Tidewater Minion does not have summoning sickness

Steps

1. Activate Tidewater Minion by tapping itself, targeting itself
2. Magda triggers, creating a creature token
3. Resolve Tidewater Minion's ability, untapping itself
4. Repeat

Results

• Infinite colored mana
• Infinite Treasure tokens
• Put any number of artifacts and creatures from your library onto the battlefield
• Put all Dragon and artifact cards from your library onto the battlefield