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Promise of Loyalty

· Sorcery · Marvel Super Heroes Commander (MSC)

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Times Brought

539

Decks Running

288

In Decks

—

Decklist Inclusion

—

Format

Multiplayer 1v1

Showing 1v1 (duel) data only. 1v1 is a different format from multiplayer Commander, so these numbers are not comparable.

Card text

Promise of Loyalty

Sorcery

Each player puts a vow counter on a creature they control and sacrifices the rest. Each of those creatures can't attack you or planeswalkers you control for as long as it has a vow counter on it.

Marvel Super Heroes Commander (MSC) · Rare · Illustrated by Sveta Pikul

Final zone distribution

116 instances

1.7%

Library

3.4%

Battlefield

47.4%

Graveyard

8.6%

Exile

Commanders that played this card

in tracked games

The "good card" funnel

539 brought · 265 players

Brought to game

539

Ever drawn

111

Reached battlefield

Still on board at game end

≥ -13.9pp

Players who cast this card win 20% of the time (n=43) , vs 26% when it never left the library (n=323).

When players drew this card but left it in hand, they won 31% (n=47) — about the same as leaving it in the library. Those players survived long enough to draw it, so the gap above is about the card resolving, not just about surviving.

Observed gap -6.1pp; 95% confidence interval -13.9pp to +1.7pp. Correlational, not causal: powerful payoffs also get cast more often in games you are already winning.

First-cast turn

n=52

12%

60%

T6-9

21%

T10+

Median 7.0 P25 6 · P75 9 · max 14

On curve 19% (6 / 52 cast on T5) Cast same turn as drawn 28%

52 of 100 times cast 52%

Full analysis unlocks as more games are tracked. Stats refresh nightly.

Frequently Asked

Why isn't there more data on this card?

Playgroup Live collects per-card gameplay data from real Commander games. Basic play counts appear once a card reaches 100 tracked games; the full deep-dive page needs a larger, more diverse sample (at least 300 tracked games played by 10 or more different pilots, with no single pilot over 40 percent of the copies). 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 650,000+ Commander games overall, and this card-level play data comes from the Playgroup Live subset of that corpus.