Live Play Data

Promise of Loyalty

· Sorcery · Marvel Super Heroes Commander (MSC)

Live Inclusion

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Times Brought

3089

Decks Running

1386

Median Cast Turn

8.0

Drawn → Played

55%

Format

Multiplayer 1v1

First-cast turn

n=408

11%

65%

T6-9

21%

T10+

Median 8.0 P25 6 · P75 9 · max 17

On curve 14% (46 / 408 cast on T5) Cast same turn as drawn 28%

The "good card" funnel

3089 brought · 1180 players

Brought to game

3089

Ever drawn

747

Reached battlefield

408

Still on board at game end

≥ +0.4pp

Players who cast this card win 29% of the time (n=369) , vs 24% when it never left the library (n=1963).

When players drew this card but left it in hand, they won 31% (n=304).

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 +5.2pp; 95% confidence interval +0.4pp to +10.0pp. Correlational, not causal: powerful payoffs also get cast more often in games you are already winning.

Final zone distribution

811 instances

3.6%

Library

4.4%

Battlefield

50.2%

Graveyard

5.7%

Exile

Commanders that played this card

in tracked games

1 Ms. Bumbleflower 213 decks
2 Killian, Decisive Mentor 142 decks
3 Tidus, Yuna's Guardian 133 decks
4 Mister Fantastic 56 decks
5 Y'shtola, Night's Blessed 47 decks
6 Commodore Guff 45 decks
7 Sidar Jabari of Zhalfir 34 decks
8 Nelly Borca, Impulsive Accuser 33 decks
9 Yennett, Cryptic Sovereign 33 decks
10 Breena, the Demagogue 32 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 740,000+ Commander games overall, and this card-level play data comes from the Playgroup Live seats playing virtual cards, a subset of that corpus.