Sulfurous Springs

{T}: Add {C}.
{T}: Add {B} or {R}. This land deals 1 damage to you.

Siege-Gang Commander

When this creature enters, create three 1/1 red Goblin creature tokens.
{1}{R}, Sacrifice a Goblin: This creature deals 2 damage to any target.

Kardur, Doomscourge

When Kardur enters, until your next turn, creatures your opponents control attack each combat if able and attack a player other than you if able.
Whenever an attacking creature dies, each opponent loses 1 life and you gain 1 life.

Mindwhip Sliver

All Slivers have "{2}, Sacrifice this permanent: Target player discards a card at random. Activate only as a sorcery."

Chainbreaker

This creature enters with two -1/-1 counters on it.
{3}, {T}: Remove a -1/-1 counter from target creature.

Ancient Brass Dragon

Flying
Whenever this creature deals combat damage to a player, roll a d20. When you do, put any number of target creature cards with total mana value X or less from graveyards onto the battlefield under your control, where X is the result.

Manabarbs

Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.

Taunting Kobold

Haste
Whenever this creature attacks, goad target creature an opponent controls. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Mountain

Ogre Warrior

Livaan, Cultist of Tiamat

Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value.
Choose a Background (You can have a Background as a second commander.)

Might Sliver

Marching Duodrone

Whenever this creature attacks, each player creates a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Firestorm

As an additional cost to cast this spell, discard X cards.
Firestorm deals X damage to each of X targets.

Skyshroud Archer

{T}: Target creature with flying gets -1/-1 until end of turn.

Dakmor Plague

Dakmor Plague deals 3 damage to each creature and each player.

Hollow Dogs

Whenever this creature attacks, it gets +2/+0 until end of turn.

Soul Rend

Destroy target creature if it's white. A creature destroyed this way can't be regenerated.
Draw a card at the beginning of the next turn's upkeep.

Fevered Convulsions

{2}{B}{B}: Put a -1/-1 counter on target creature.

Furnace Spirit

Haste
{R}: This creature gets +1/+0 until end of turn.

Well of Lost Dreams

Whenever you gain life, you may pay {X}, where X is less than or equal to the amount of life you gained. If you do, draw X cards.

Ignorant Bliss

Exile all cards from your hand face down. At the beginning of the next end step, return those cards to your hand, then draw a card.

Orcish Artillery

{T}: This creature deals 2 damage to any target and 3 damage to you.

Manamorphose

Add two mana in any combination of colors.
Draw a card.

Fog of Gnats

Swamp

Segmented Wurm

Whenever this creature becomes the target of a spell or ability, put a -1/-1 counter on it.

Shock Troops

Sacrifice this creature: It deals 2 damage to any target.

Mongrel Pack

When this creature dies during combat, create four 1/1 green Dog creature tokens.

Nameless Inversion

Changeling (This card is every creature type.)
Target creature gets +3/-3 and loses all creature types until end of turn.

Primal Forcemage

Whenever another creature you control enters, that creature gets +3/+3 until end of turn.

Tibalt, Cosmic Impostor

As Tibalt enters, you get an emblem with "You may play cards exiled with Tibalt, Cosmic Impostor, and you may spend mana as though it were mana of any color to cast those spells."
+2: Exile the top card of each player's library.
−3: Exile target artifact or creature.
−8: Exile all graveyards. Add {R}{R}{R}.

Valki, God of Lies

When Valki enters, each opponent reveals their hand. For each opponent, exile a creature card they revealed this way until Valki leaves the battlefield.
{X}: Choose a creature card exiled with Valki with mana value X. Valki becomes a copy of that card.

Valki, God of Lies // Tibalt, Cosmic Impostor

Thrashing Wumpus

{B}: This creature deals 1 damage to each creature and each player.

Overrun

Creatures you control get +3/+3 and gain trample until end of turn. (Each of those creatures can deal excess combat damage to the player or planeswalker it's attacking.)

Horn of Greed

Whenever a player plays a land, that player draws a card.

Symbiosis

Two target creatures each get +2/+2 until end of turn.

Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Rampant Growth

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Nightcreep

Until end of turn, all creatures become black and all lands become Swamps.

Familiar Ground

Each creature you control can't be blocked by more than one creature.

Firespout

Firespout deals 3 damage to each creature without flying if {R} was spent to cast this spell and 3 damage to each creature with flying if {G} was spent to cast this spell. (Do both if {R}{G} was spent.)

Ageless Entity

Whenever you gain life, put that many +1/+1 counters on this creature.

Scavenger Folk

{G}, {T}, Sacrifice this creature: Destroy target artifact.

Squeaking Pie Sneak

As an additional cost to cast this spell, reveal a Goblin card from your hand or pay {3}.
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Throne of Death

At the beginning of your upkeep, mill a card.
{2}{B}, {T}, Exile a creature card from your graveyard: Draw a card.

Egon, God of Death

Deathtouch
At the beginning of your upkeep, exile two cards from your graveyard. If you can't, sacrifice Egon and draw a card.

Egon, God of Death // Throne of Death

Sunder from Within

Sulfurous Blast

Sulfurous Blast deals 2 damage to each creature and each player. If you cast this spell during your main phase, Sulfurous Blast deals 3 damage to each creature and each player instead.

Sek'Kuar, Deathkeeper

Whenever another nontoken creature you control dies, create a 3/1 black and red Graveborn creature token with haste.

Violet Pall

Destroy target nonblack creature. Create a 1/1 black Faerie Rogue creature token with flying.

Deep Wood

Cast this spell only during the declare attackers step and only if you've been attacked this step.
Prevent all damage that would be dealt to you this turn by attacking creatures.

Furnace Brood

{R}: Target creature can't be regenerated this turn.

Dogpile

Dogpile deals damage to any target equal to the number of attacking creatures you control.

Unearth

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

Fire Whip

Enchant creature you control
Enchanted creature has "{T}: This creature deals 1 damage to any target."
Sacrifice this Aura: It deals 1 damage to any target.

Nausea

All creatures get -1/-1 until end of turn.

Acidic Sliver

All Slivers have "{2}, Sacrifice this permanent: This permanent deals 2 damage to any target."

Naturalize

Mindlash Sliver

All Slivers have "{1}, Sacrifice this permanent: Each player discards a card."

Thoughtbound Primoc

Flying
At the beginning of your upkeep, if a player controls more Wizards than each other player, the player who controls the most Wizards gains control of this creature.

Unnatural Hunger

Enchant creature
At the beginning of the upkeep of enchanted creature's controller, this Aura deals damage equal to that creature's power to that player unless they sacrifice another creature of their choice.