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Deathbloom Thallid and Tukatongue Thallid replace themselves with a Saproling when they die but wont ever make more than one
So...what decks are running this
If you pair that with a damage-doubling card like Furnace of Rath or Twinflame Tyrant, you'll kill anyone with an even life total
The primary Commander creature is Leinore, Autumn Sovereign , which is emblematic of the entire deck with its +1/+1 counter-based coven ability, and it can even draw cards to rack up card advantage without needing blue mana
This is why the leaves the battlefield trigger really helps because it keeps your counters in play like modular, but also counts if it is bounced, flickered, or airbent