Acidic Soil deals damage to each player equal to the number of lands they control.

{T}: Add one mana of any color in your commander's color identity.

Indestructible

Whenever Brash Taunter is dealt damage, it deals that much damage to target opponent.

{2}{R}, {T}: Brash Taunter fights another target creature.

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

{3}, Sacrifice Burnished Hart: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Flying

Whenever an opponent is dealt noncombat damage, Chandra's Spitfire gets +3/+0 until end of turn.

Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.

Whenever you cast an instant or sorcery spell, Guttersnipe deals 2 damage to each opponent.

Lightning Bolt deals 3 damage to any target.

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

{T}: Add {C}.

{1}, {T}, Sacrifice Mind Stone: Draw a card.

Companion -- Your starting deck contains only cards with odd mana values and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.)

If a source you control with an odd mana value would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

{1}, {T}: Add {B}{R}.

Target opponent may have Risk Factor deal 4 damage to them. If that player doesn't, you draw three cards.

Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

{T}: Add {C}{C}.

When Solemn Simulacrum enters the battlefield, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

When Solemn Simulacrum dies, you may draw a card.

Defender

{T}: Spear Spewer deals 1 damage to each player.

Whenever a player casts a spell, Spellshock deals 2 damage to that player.

At the beginning of each player's upkeep, Sulfuric Vortex deals 2 damage to that player.

If a player would gain life, that player gains no life instead.

If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.

Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)

At the beginning of the end step, sacrifice Underworld Breach.

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Whenever a land enters the battlefield, Zo-Zu the Punisher deals 2 damage to that land's controller.