Feast of Sanity, Mind Over Matter, and Veinwitch Coven

Prerequisites

• Feast of Sanity on the battlefield
• Mind Over Matter on the battlefield
• Veinwitch Coven on the battlefield
• You have at least one creature card in hand
• You control a Swamp

Steps

1. Activate a Swamp by tapping it, adding
2. Activate Mind over Matter by discarding a creature card
3. Feast of Sanity triggers, dealing 1 damage to any target and causing you to gain 1 life
4. Veinwitch Coven triggers, causing you to pay to return any creature card from your graveyard to your hand
5. Resolve the Mind over Matter ability, untapping a Swamp you control
6. Repeat

Results

• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers
• Infinite self-discard triggers