Legendary Creature - Human Rogue (R)
When Amarant Coral enters the battlefield you may sacrifice an artifact, if you do, Amarant Coral gets +1/+0 until end of turn and deals damage equal to its power to target creature. Excess damage is dealt to that creature’s controller instead.
I wanted to convey Amarant's throw ability. I thought of multiple cards to get to this iteration of Amarant - Bosh, Iron Golem, Flametongue Kavu, and Ram Through. I made some last minute adjustments - originally Amarant was a 2/2 and got a pump equal to the sacrificed artifact's mana value but when I compared that iteration against Flametongue Kavu, it just felt far too strong. If you sacrificed a 3 mana artifact you could deal up to five damage to a creature, deal any excess damage to an opponent and then swing with a power boosted creature on top of all that which is just too much.
My next iteration, had Amarant as a 2/2 and the pump was +2/+0, I think this was okay if you have an artifact to sacrifice, but without it the floor here was too low. I finally settled on making the pump just +1/+0 and raising the p/t to 3/2. I think this gives the card a passable floor while allowing this to do an explosive FTK+ effect when you sacrifice an artifact. I chose not to add an additional toughness to help balance out how powerful this can be when the ability goes off.
If you have an artifact to sacrifice for Amarant he effectively provides a Flame Spill attached to a 4/2 hasty body.
Seems good from a gameplay standpoint. I agree with Creedmoor that I don't see anything that makes it specifically green, but I don't know enough about the character it know if its warranted for their personality. That's not to say it shouldn't have green, just that it could easily be mono-red if needed.