Playing around with variants on my favorite mechanic today...
Dance of the Deathmage GB
Sorcery - Uncommon
Target creature you control gains deathtouch until end of turn. That creature fights another target creature you don't control.
Immortal Combat 2GW
Sorcery - Uncommon
Target creature you control gets indestructible until end of turn. That creature fights another target creature you don't control.
Trial by Combat 3RW
Sorcery - Rare
Target creature you control fights target creature you don't control. If a creature dealt damage this way would die this turn, that creature's controller sacrifices all creatures he or she controls.
Dance of the Deathmage is clever. I like that. One might question the green part of the card, because it plays a bit like a spot removal with a creature sacrifice as an additional cost most of the time, but it's nothing major.
Immortal Combat, while technically a green/white card plays more like a red card. Essentially it simply says "Target creature you control deals damage to another target creature equal to its power." That is a very red effect.
Misdirected Rage, see Blood Feud. Not sure why you made yours blue, but it makes some sense flavourwise, so why not?
As for Trial by Combat, I'm not sure if that card isn't too powerful, or to be more precise: fun at all. The card simply reads "If you control a creature that can survive any creature an opponent controls, they have to get rid of all creatures they control, be they indestructibe or regenerating." Barring combat tricks you always clear your enemy's board if they play some 1/1 creatures or similarly small creatures. Another thing is that the card doesn't have quite the drama gameplay wise as it appears at first glance. Barring combat tricks, there is no real suspense who's going to win, so you'll never cast it if you'd only wipe your own board. A more interesting approach would be if the stakes were lowered and if there was a way for both players to influence the outcome after it has been announced. Suspend comes to mind, for instance.
Dance of the Deathmage GB
Sorcery - Uncommon
Target creature you control gains deathtouch until end of turn. That creature fights another target creature you don't control.
Immortal Combat 2GW
Sorcery - Uncommon
Target creature you control gets indestructible until end of turn. That creature fights another target creature you don't control.
Misdirected Rage 1UR
Sorcery - Rare
Target creature fights another target creature.
Trial by Combat 3RW
Sorcery - Rare
Target creature you control fights target creature you don't control. If a creature dealt damage this way would die this turn, that creature's controller sacrifices all creatures he or she controls.
Random designs without any context. Thoughts?
My custom sets:
Caeia Block (Released - Beta)
Generals of Dareth (In Design)
Immortal Combat, while technically a green/white card plays more like a red card. Essentially it simply says "Target creature you control deals damage to another target creature equal to its power." That is a very red effect.
Misdirected Rage, see Blood Feud. Not sure why you made yours blue, but it makes some sense flavourwise, so why not?
As for Trial by Combat, I'm not sure if that card isn't too powerful, or to be more precise: fun at all. The card simply reads "If you control a creature that can survive any creature an opponent controls, they have to get rid of all creatures they control, be they indestructibe or regenerating." Barring combat tricks you always clear your enemy's board if they play some 1/1 creatures or similarly small creatures. Another thing is that the card doesn't have quite the drama gameplay wise as it appears at first glance. Barring combat tricks, there is no real suspense who's going to win, so you'll never cast it if you'd only wipe your own board. A more interesting approach would be if the stakes were lowered and if there was a way for both players to influence the outcome after it has been announced. Suspend comes to mind, for instance.