Kalamax, the Stormsire, Nexus of Fate, Merchant Scroll, Narset's Reversal, and Cryptolith Rite

Prerequisites

• Kalamax, the Stormsire on the battlefield
• Nexus of Fate in hand
• Merchant Scroll in hand
• Narset's Reversal in hand
• Cryptolith Rite on the battlefield
• available

Steps

1. Activate Kalamax by tapping it, adding one mana of any color
2. Cast Nexus of Fate by paying
3. Kalamax first and second abilities triggers
4. Resolve the first ability, creating a copy of Nexus of Fate
5. Resolve Kalamax's second ability, putting a +1/+1 counter on itself
6. Resolve the copy of Nexus of Fate, taking an extra turn after this one
7. Resolve the Nexus of Fate, taking an extra turn after this one
8. Pass to next turn
9. Activate Kalamax by tapping it, adding one mana of any color
10. Cast Merchant Scroll by paying
11. Holding priority, cast Narset's Reversal by paying , targeting Merchant Scroll
12. Kalamax first and second abilities triggers
13. Resolve the first ability, creating a copy of Narset's Reversal, targeting the first Narset's Reversal
14. Resolve Kalamax's second ability, putting a +1/+1 counter on itself
15. Resolve the copy of Narset's Reversal, returning it to your hand and choosing Merchant Scroll
16. Resolve the Narset's Reversal, returning Merchant Scroll to your hand and search your library for Nexus of Fate and putting in your hand
17. Pass the turn
18. Repeat

Results

• Infinite turns
• Lock