Requires

All permanents on the battlefield. available.

Steps

1. Activate Ashnod's Altar by sacrificing Drizzt, adding
2. Nim Deathmantle triggers
3. Pay for the Nim Deathmantle trigger, returning Drizzt to the battlefield and attaching Nim Deathmantle to it
4. Drizzt and Dual Nature trigger
5. Resolve the Drizzt trigger, creating a legendary Cat creature token
6. Activate Ashnod's Altar by sacrificing the Cat creature token, adding
7. Drizzt triggers, putting a number of +1/+1 counters on Drizzt equal to the difference
8. Repeat
9. Once you have infinite Dual Nature triggers on the stack, resolve each one, creating a token copy of Drizzt
10. The token copy of Drizzt triggers
11. The token copy of Drizzt is put into your graveyard due to the legend rule
12. Resolve the Drizzt trigger, putting a legendary Cat token onto the battlefield
13. Activate Ashnod's Altar by sacrificing the Cat token, adding
14. Repeat until there are no Dual Nature triggers remaining

Results