Glint-Horn Buccaneer, Murderer's Axe, and Snake Umbra

Prerequisites

• Glint-Horn Buccaneer on the battlefield
• Murderer's Axe on the battlefield
• Snake Umbra on the battlefield
• An additional card in hand
• The number of cards in library is greater than each opponent's life total
• Snake Umbra attached to Glint-Horn Buccaneer

Steps

1. Activate Murderer's Axe's equip ability by discarding a card, targeting any creature
2. Glint-Horn Buccaneer triggers, dealing 1 damage to each opponent
3. Snake Umbra triggers for each opponent dealt damage
4. Resolve one trigger, causing you to draw a card
5. Holding priority, repeat
6. Repeat

Results

• Infinite card draw
• Near-infinite damage
• Near-infinite self-discard triggers