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Part of Bloomburrow
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Creature — Elemental Snake
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Bloomburrow (BLB)
Live Play Data
Rottenmouth Viper
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Creature — Elemental Snake
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Bloomburrow (BLB)
1%
Live Inclusion
Times Brought
390
Decks Running
184
Median Cast Turn
6.5
Drawn → Played
60%
Format
First-cast turn
n=64
2%
T1
2%
T2
2%
T3
6%
T4
17%
T5
58%
T6-9
14%
T10+
Median
6.5
P25
5
· P75
8
· max
13
On curve
50%
(14 / 64 cast on T6)
Cast same turn as drawn
32%
The "good card" funnel
390 brought · 172 playersBrought to game
390
Ever drawn
107
Reached battlefield
64
Still on board at game end
29
Once cast, 45% of this card is still on the battlefield at game end. This reflects how often it survives removal, not just whether it's a permanent.
≥ -1.5pp
Players who cast this card win 38% of the time (n=56) , vs 26% when it never left the library (n=247).
When players drew this card but left it in hand, they won 17% (n=38).
Read this as correlation, not as the card's contribution. Casting a card means you lived long enough to cast it, so this gap widens with mana value across every card we track.
Observed gap +11.7pp; 95% confidence interval -1.5pp to +24.9pp. Correlational, not causal: powerful payoffs also get cast more often in games you are already winning.
Final zone distribution
117 instances2.6%
Library
24.8%
Battlefield
33.3%
Graveyard
10.3%
Exile
Commanders that played this card
in tracked games-
1
Ashling, the Limitless
47 decks
-
2
Aphelia, Viper Whisperer
11 decks
-
3
Tinybones, Bauble Burglar
7 decks
-
4
Isshin, Two Heavens as One
6 decks
-
5
Vren, the Relentless
6 decks
-
6
Valgavoth, Terror Eater
5 decks
-
7
Endrek Sahr, Master Breeder
4 decks
-
8
Hazel of the Rootbloom
3 decks
-
9
Henzie "Toolbox" Torre
3 decks
-
10
Kefka, Court Mage // Kefka, Ruler of Ruin
3 decks
Card text
Rottenmouth Viper
Creature — Elemental Snake
As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs 
less to cast for each permanent sacrificed this way.
Whenever this creature enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent of their choice or discards a card.
less to cast for each permanent sacrificed this way.
Whenever this creature enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent of their choice or discards a card.6 / 6
Bloomburrow (BLB)
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Mythic
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Illustrated by Andrea Piparo
Frequently Asked
Why isn't there more data on this card?
Playgroup Live collects per-card gameplay data from real Commander games. Play counts appear once a card reaches 100 tracked games, and the full charts need a sample of at least 25 observed games that is not dominated by a single pilot. Until this card clears those bars you're seeing only the basic counts. Stats refresh nightly.
How is Playgroup Live card data collected?
Players using Playgroup Live import their decklists before a game and log card actions as they play. Each cast, zone change, and resolution is recorded as a real game event. Stats on this site are computed from those events, not from decklist scrapes or theorycrafting. Playgroup has recorded 720,000+ Commander games overall, and this card-level play data comes from the Playgroup Live seats playing virtual cards, a subset of that corpus.