A Proposed Expansion to WOTC's Magic: The Gathering

Allaryn's Apprentice
(Common 1 ×3)
1B
Summon Wizard, 1/1
U, Tap: Look at the top three cards of target opponent's library and return them back in the same order.
[v1]
[v2]
[v3]

Apprentice of Tralos
(Common 1 ×3)
1BB
Summon Wizard, 1/1
Tap: Target demon gets +1/+1 until end of turn.
Tap: Sacrifice Apprentice of Tralos, and pay 2 life, to bring a demon card from your hand directly into play as though just summoned.
[v1]
[v2]
[v3]

Dark Apprentice
(Common 1 ×3)
1B
Summon Wizard, 1/1
Tap: Sacrifice a creature you control to add an amount of black mana to your mana pool equal to the creature's power or toughness, whichever is less. Treat this as an interrupt.
[v1]
[v2]
[v3]

Dark Assassin
(Common 1 ×3)
1BB
Summon Assassin, 1/1
X, Tap: Sacrifice Dark Assassin to bury non-wall creature having a toughness no greater than X.
0: Pay 1 life to return Dark Assassin to your hand from the graveyard.
[v1] Allaryn did not restrict herself to sorcery alone. She could get almost as much accomplished by her spies as by her magics.
[v2]
[v3]

Darkbolt
(Common 1 ×3)
XXB
Instant
Do one damage to each of X+1 target creatures.
[v1] "Hah! No more pesky swordsmen." -- Tralos the Mis-Shapen
[v2]
[v3]

Demon Warrior
(Common 1 ×3)
2B
Summon Demon, 2/1
Flying
R: Trample until end of turn.
[v1]
[v2]
[v3]

Demonic Brute
(Uncommon 1)
4BBB
Summon Demon, 8/6
Trample, rampage: 2
Pay BBB during your upkeep, or Demonic Brute is tapped and does 8 damage to you.
"You want us to fight that?!... How much are you paying us, again?" -- Erik Vandalsen, veteran mercenary
(Author's Note: I've just got to get this card illustrated by Phil Foglio! :-)

Demonic Legion
(Uncommon 1)
2BB
Summon Demons, 0/4
Flying, trample
0: Sacrifice a creature you control to give Demonic Legion +2/+0 until end of turn.

Demonic Swarm
(Uncommon 2)
XXBBB
Sorcery
Bring X+1 Petty Demon tokens into play. Treat these tokens as 1/1 black creatures with flying. Remove Demonic Swarm from the game.
"Come to me, my children! Together, we shall feast on the souls of our enemies!" -- Tralos the Mis-Shapen

Diabolic Reward
(Uncommon 3)
BB
Interrupt
Add X colorless mana to your mana pool, where X is the number of black permanents you control. Remove Diabolic Reward from the game.

Frenzied Demon
(Common 1 ×3)
3B
Summon Demon, 0/2
Trample, rampage: 1
B: +1/+0
[v1]
[v2]
[v3]

Hellspawn
(Common 1 ×3)
0
Summon Imp, 0/1
Flying
This card is a black spell when cast, and Hellspawn is a black creature.
[v1] In spite of not being true demons, hellspawn were often the first creatures an aspiring darkmage learned to summon.
[v2]
[v3]

Infernal Gateway
(Uncommon 1)
BBBB
Enchantment
Comes into play tapped.
Cumulative upkeep: Sacrifice a creature you control.
Tap: Sacrifice a creature you own and control, and remove it from the game. Bring X Petty Demon tokens into play, where X is the casting cost of the sacrificed creature. Treat each Petty Demon token as a 1/1 black creature with flying.

Minion of Tralos
(Uncommon 1)
4BBB
Summon Demon, 4/4
1: +1/-1; you cannot reduce toughness below 1 in this manner.
1: -1/+1; you cannot reduce power below 0 in this manner.
"Completely malleable to my will, in every way. The perfect minion." -- Tralos the Mis-Shapen
(Author's Note: Remember that I wrote these cards before they changed the Pumping rules with Fifth Edition.)

Wall of Demons
(Uncommon 1)
3BBB
Summon Wall, 0/1
Flying
Place four +1/+1 demon counters on Wall of Demons when first brought into play. During your upkeep, you may remove one or more of these counters from Wall of Demons. For each +1/+1 demon counter removed, bring a Petty Demon token into play. Treat these tokens as 1/1 black creatures with flying.
0: Sacrifice a demon you control to place a +1/+1 demon counter onto Wall of Demons.