{T}: Add one mana of any color in your commander's color identity.
{1}{B}
Feed the Swarm
Sorcery
Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.
{5}{B}{B}{B}
Hoarding Broodlord
Creature - Dragon
Convoke
Flying
When Hoarding Broodlord enters the battlefield, search your library for a card, exile it face down, then shuffle. For as long as that card remains exiled, you may play it.
Spells you cast from exile have convoke.
7 /
6
{X}{B}
March of Wretched Sorrow
Instant
As an additional cost to cast this spell, you may exile any number of black cards from your hand. This spell costs {2} less to cast for each card exiled this way.
March of Wretched Sorrow deals X damage to target creature or planeswalker and you gain X life.
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{1}{B}{B}
Phyrexian Arena
Enchantment
At the beginning of your upkeep, you draw a card and you lose 1 life.
{1}{B}{R}
Rowan, Scion of War
Legendary Creature - Human Wizard
Menace
{T}: Spells you cast this turn that are black and/or red cost {X} less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.