Ketramose, the New Dawn, Containment Construct, Psychic Frog, and Horizon Chimera

Prerequisites

• Ketramose, the New Dawn on the battlefield
• Containment Construct on the battlefield
• Psychic Frog on the battlefield
• Horizon Chimera on the battlefield
• You have a card in hand
• Your life total is at least 2

Steps

1. Activate Psychic Frog by discarding a card
2. Containment Construct triggers, exiling the discarded card with the ability to play it until end of turn
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 with the ability to play the exiled cards until end of turn
• Near-infinite +1/+1 counters on Psychic Frog