Leonardo, Sewer Samurai + Solemnity + Phyrexian Walker + Bloodflow Connoisseur

Leonardo, Sewer Samurai

Solemnity

Phyrexian Walker

Bloodflow Connoisseur

How it works

1. Activate Bloodflow Connoisseur by sacrificing Phyrexian Walker.
2. Cast Phyrexian Walker from your graveyard by paying 0. It will not enter with a finality counter on it due to Solemnity.
3. Repeat.

This clever loop turns the graveyard into a reliable staging ground by leaning on Leonardo, Sewer Samurai to repeatedly cast Phyrexian Walker for free. Normally, Leonardo's casting restriction would slap a finality counter on the artifact creature to exile it upon death, but Solemnity acts as an absolute shield to completely shut down counters from being placed on creatures. With the restriction nullified, you can sacrifice Phyrexian Walker to Bloodflow Connoisseur to fuel an endless chain of sacrifices, driving up massive storm counts, triggering continuous death effects, and growing the Connoisseur with infinite +1/+1 counters.