Nonblack poison, nonwhite metal.

Glissa, Blightsteel Traitor
Legendary Artifact Creature - Elf Construct (R)
Infect
Other artifacts you control have infect.
When a player has 8 or more poison counters on them, that player loses the game.
1/3

BeneTleilax(Noxious Spread): I really like this card. I think it could be 3CMC(maybe at 1GG), but the design is nice and I really like the doubling mechanic being capped by mana. netn10(The Moon Befalls): I really liked the card until I got to the basic land hosing. One reason to play 1 color is to ...

Lifedrinker
Artifact - Equipment (R)
Equipped creature gets +2/+0 and has lifelink.
Pay 2 life: Equipped creature gets +1/+0 until end of turn.
Equip

My theme is metal.
Metallic Echo
Enchantment (R)
Whenever a nontoken artifact enters the battlefield under your control, create a token that's a copy of it, except it has haste. Sacrifice that token at the beginning of the next end step.

Most of this is pretty good, but Blackmail seems a bit narrow and parasitic. Would something like Revolt but for opponents still make sense? I do like how the three(four?) mechanics work together well and am interested to see how the set turns out.