Streetwise Scoundrels is part of a cycle of "enhanced" creatures in my set. (Some monocolored creatures in my set have a bigger effect if mana of a specific color was used to pay their costs.) Here are some others:
Black Flame Zealot
3W
Creature – Human Soldier (Common)
2/4
When Black Flame Zealot enters the battlefield, if B was spent to cast Black Flame Zealot, target creature gets -1/-1 until end of turn.
Exotic Weapon Master
2W
Creature – Human Soldier (Common)
2/2
Flash
When Exotic Weapon Master enters the battlefield, if R was spent to cast Exotic Weapon Master, it gains haste until end of turn.
W, T: Tap target creature.
Crosswind Drake
3U
Creature – Drake (Common)
3/1
Flash
Flying
When Crosswind Drake enters the battlefield, if G was spent to cast Crosswind Drake, regenerate it.
(Would the card name Fierce Gull, with the creature type Bird, be more flavourful?)
Canopy Owl
3G
Creature – Bird (Common)
2/2
Flying
When Canopy Owl enters the battlefield, if U was spent to cast Canopy Owl, look at the top four cards of your library, then put them back in any order.
(I like this as an owl, for
obvious reasons, but some concerns were raised over giving green a 2/2 flyer. What do you think? A 1/1 flyer would be too weak compared to the rest of the cycle. I could always take away the flying and make it an elf...)