Rootha, Mercurial Artist, Sneak Attack, and Mana Geyser

Prerequisites

• Rootha, Mercurial Artist on the battlefield
• Sneak Attack on the battlefield
• Mana Geyser in hand
• Opponents control at least three tapped lands
• available

Steps

1. Cast Mana Geyser by paying
2. Holding priority, activate Rootha by paying and returning it from the battlefield to your hand, copying Mana Geyser
3. Resolve the copy of Mana Geyser, adding at least
4. Activate Sneak Attack by paying , putting Rootha from your hand onto the battlefield
5. Repeat from step 2
6. If opponents control four or more tapped lands, this combo nets infinite red mana

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite red mana