So at what step during the casting process do you risk the creature and at what step does the opponent choose whether you sacrifice it and at what step do you sacrifice it? That's rather complex and probably would be best somehow incorporated into the casting cost.
It's a daunting task to word this ability as anything but a separate ability - probably a keyword ability like kicker.
Is this ability actually fun to play? It usually just amounts to losing creatures when the game state makes the move something your opponent is fine with e. g. this card is just removal that also causes yout to sacrifice a creature if the opponent controls only one creature and that is already tapped.
I'd guess it would be more fun if your opponent chooses the cost and you can sometimes surprise them with being totally fine with dispatching of a minion. Or maybe as a more Fact or Fiction/Torment choice.
2019-11-06 14:58:53:
continuumg
commented on the cardset Noir
Current Archetype Breakdowns
Oppress - ,
Conceal - ,
Exploit - ,
Outwit - ,
Wager - ,
I’m not entirely happy with having wager in white. I might want to find a way to let white synergize with that mechanic without actually using it, like what I am doing with blue and Oppress.
2019-11-06 01:31:04:
continuumg
deleted a mechanic in Noir
2019-11-06 01:30:53:
continuumg
deleted a mechanic in Noir
See Random Act of Violence and William's Gambit.
See William's Gambit. Possible Gambit replacement
Possible replacement for the "Gambit" mechanic.
Riff as food for thought: Outwit.
So at what step during the casting process do you risk the creature and at what step does the opponent choose whether you sacrifice it and at what step do you sacrifice it? That's rather complex and probably would be best somehow incorporated into the casting cost.
It's a daunting task to word this ability as anything but a separate ability - probably a keyword ability like kicker.
Is this ability actually fun to play? It usually just amounts to losing creatures when the game state makes the move something your opponent is fine with e. g. this card is just removal that also causes yout to sacrifice a creature if the opponent controls only one creature and that is already tapped.
I'd guess it would be more fun if your opponent chooses the cost and you can sometimes surprise them with being totally fine with dispatching of a minion. Or maybe as a more Fact or Fiction/Torment choice.
Possible alternative to current gambit. See Retributive Gambit.
Gambit will now be a subtype rather than a keyword.
Current Archetype Breakdowns
Oppress -
, 
Conceal -
, 
Exploit -
, 
Outwit -
, 
Wager -
, 
I’m not entirely happy with having wager in white. I might want to find a way to let white synergize with that mechanic without actually using it, like what I am doing with blue and Oppress.
No longer unpracticed! Completely different ability.