Shadowsteel Cutthroat

First Strike, Steelborn (As long as this creature is equipped it gets +1/+1)
Whenever a creature dealt combat damage by Shadowsteel Cutthroat is put into the graveyard this turn, add {c} to your mana pool equal to that creatures converted mana cost in your postcombat main phase. You may only spend this mana on equipment or equip costs.
The shadows are warmer than they are.