Live Play Data

Promise of Loyalty

· Sorcery · Marvel Super Heroes Commander (MSC)

Live Inclusion

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Times Brought

1017

Decks Running

505

Median Cast Turn

8.0

Drawn → Played

54%

Format

Multiplayer 1v1

First-cast turn

n=144

11%

67%

T6-9

19%

T10+

Median 8.0 P25 6 · P75 9 · max 13

On curve 13% (16 / 144 cast on T5) Cast same turn as drawn 34%

The "good card" funnel

1017 brought · 444 players

Brought to game

1017

Ever drawn

267

Reached battlefield

144

Still on board at game end

≥ -1.3pp

Players who cast this card win 28% of the time (n=134) , vs 22% when it never left the library (n=633).

When players drew this card but left it in hand, they won 29% (n=110).

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 +6.4pp; 95% confidence interval -1.3pp to +14.1pp. Correlational, not causal: powerful payoffs also get cast more often in games you are already winning.

Final zone distribution

285 instances

3.9%

Library

3.5%

Battlefield

53.7%

Graveyard

3.2%

Exile

Commanders that played this card

in tracked games

1 Ms. Bumbleflower 83 decks
2 Killian, Decisive Mentor 75 decks
3 Tidus, Yuna's Guardian 50 decks
4 Mister Fantastic 22 decks
5 Y'shtola, Night's Blessed 18 decks
6 Gluntch, the Bestower 16 decks
7 Commodore Guff 14 decks
8 Nelly Borca, Impulsive Accuser 14 decks
9 Breena, the Demagogue 13 decks
10 Sidar Jabari of Zhalfir 12 decks

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

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 680,000+ Commander games overall, and this card-level play data comes from the Playgroup Live subset of that corpus.