Spiteful Squad dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the
Bloodflow Connoisseur ability.
Repeat.
Notes
When
Spiteful Squad dies with a +1/+1 counter on it, that counter can be placed onto another creature. If that creature had a -1/-1 counter on it, it will be removed, allowing it to be returned via persist.
Results
Infinite +1/+1 counters on creatures you control.
Infinite creature ETB.
Infinite creature LTB.
Infinite death triggers.
Infinite recursion of creatures you control.
Infinite creature sacrifice triggers.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
1
2
3
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5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.