Royal Herbalist, Light of Promise, and Cryptic Trilobite

Prerequisites

• Royal Herbalist on the battlefield
• Light of Promise on the battlefield
• Cryptic Trilobite on the battlefield
• available

Steps

1. Activate Royal Herbalist by paying and exiling the top card of your library, causing you to gain 1 life
2. Cryptic Trilobite triggers, putting a +1/+1 counter on it
3. Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding that can only be spent to activate abilities
4. Repeat

Results

• Near-infinite lifegain
• Near-infinite lifegain triggers
• Exile your library