Live Play Data

Promise of Loyalty

· Sorcery · Star Trek Commander (TRC)

Live Inclusion

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Times Brought

3931

Decks Running

1715

Median Cast Turn

8.0

Drawn → Played

55%

Format

Multiplayer 1v1

First-cast turn

n=528

64%

T6-9

26%

T10+

Median 8.0 P25 7 · P75 10 · max 22

On curve 10% (44 / 528 cast on T5) Cast same turn as drawn 28%

The "good card" funnel

3931 brought · 1455 players

Brought to game

3931

Ever drawn

953

Reached battlefield

528

Still on board at game end

≥ +1.1pp

Players who cast this card win 29% of the time (n=512) , vs 24% when it never left the library (n=2656).

When players drew this card but left it in hand, they won 30% (n=408).

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 +1.1pp to +9.3pp. Correlational, not causal: powerful payoffs also get cast more often in games you are already winning.

Final zone distribution

1039 instances

3.8%

Library

4.7%

Battlefield

49.5%

Graveyard

6.4%

Exile

Commanders that played this card

in tracked games

1 Ms. Bumbleflower 242 decks
2 Killian, Decisive Mentor 162 decks
3 Tidus, Yuna's Guardian 159 decks
4 Mister Fantastic 67 decks
5 Commodore Guff 54 decks
6 Yennett, Cryptic Sovereign 53 decks
7 Y'shtola, Night's Blessed 52 decks
8 Jean-Luc Picard, Luminary 49 decks
9 Nelly Borca, Impulsive Accuser 44 decks
10 Invisible Woman 41 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.

Star Trek Commander (TRC) · Rare · Illustrated by Fajareka Setiawan

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 780,000+ Commander games overall, and this card-level play data comes from the Playgroup Live seats playing virtual cards, a subset of that corpus.