Ketramose, the New Dawn, Necropotence, Psychic Frog, and Horizon Chimera

Prerequisites

• Ketramose, the New Dawn on the battlefield
• Necropotence on the battlefield
• Psychic Frog on the battlefield
• Horizon Chimera on the battlefield

Steps

1. Activate Psychic Frog by discarding a card
2. Necropotence triggers, exiling the discarded card from your graveyard
3. Ketramose triggers, causing you to draw a card and lose 1 life
4. Horizon Chimera triggers, causing you to gain 1 life
5. Resolve the Psychic Frog ability
6. Repeat

Results

• Infinite self-discard triggers
• Near-infinite lifegain triggers
• Infinite draw triggers
• Exile your library
• Infinite rummaging
• Near-infinite +1/+1 counters on Psychic Frog