Nivix Guildmage, Unexpected Windfall, and Agatha of the Vile Cauldron

Prerequisites

• Nivix Guildmage on the battlefield
• Unexpected Windfall in hand
• Agatha of the Vile Cauldron on the battlefield
• available

Steps

1. Cast Unexpected Windfall by paying and discarding a card
2. Holding priority, activate Nivix Guildmage's second ability by paying , copying Unexpected Windfall
3. Resolve the copy of Unexpected Windfall, creating two Treasure artifact tokens and causing you to draw two cards
4. Activate both Treasures by tapping and sacrificing them, adding
5. Repeat from step 2

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite magecraft triggers