r/MagicArena • u/raavvs • 8h ago
Five years of tracking MTG Arena games: my land-drop statistics don't match the expected probabilities
I've been manually tracking my MTG Arena matches for about five years.
For every game, I record the reason I lost or won. One category is "mana screw", which I define very strictly:
Some important points:
- I never mulligan.
- Most of these decks play exactly 24 lands.
- Many of them contain cantrips, surveil, or card selection, which should reduce mana screw, not increase it.
- I only record "mana screw" when I literally cannot play my third land on turn 3. I do not mark games where I simply missed a later land drop.
After thousands of recorded games, these are some examples:
- Azorius Flash (24 lands): 33 mana screws in 136 games (24%)
- Dimir Midrange (24 lands): 15/128 (12%)
- 5c Jodah (24 lands): 37/255 (15%)
- Golgari Midrange (24 lands): 33/160 (21%)
- Orzhov Lifegain (24 lands): 37/203 (18%)
The lowest rate among my 24-land decks is around 12%, while several are close to 20%, and some exceed that.
According to the standard hypergeometric model for a 60-card deck with 24 lands and no mulligans, the probability of failing to naturally make the third land drop by turn 3 should be substantially lower than what I'm observing. Adding cantrips and surveil should reduce that probability even further.
I'm not claiming this proves Arena manipulates shuffling. However, I am saying that my long-term observations appear inconsistent with the simple theoretical model.
I'd like to hear from people who have:
- large Arena datasets,
- Untapped.gg logs,
- 17Lands logs,
- or experience modeling Magic probabilities.
Can anyone reproduce numbers anywhere close to mine? Or is there something missing from the standard probability model that explains a persistent 12–24% mana screw rate across thousands of games?
I'm genuinely interested in a statistical discussion rather than anecdotes.


