Whenever you attack, you may sacrifice another creature or an artifact. If you do, create a 4/1 black Skeleton creature token with menace that's tapped and attacking. (It can't be blocked except by two or more creatures.) Choose a Background (You can have a Background as a second commander.)

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

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

{1}, {T}, Sacrifice Chromatic Star: Add one mana of any color. When Chromatic Star is put into a graveyard from the battlefield, draw a card.

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.) Everflowing Chalice enters the battlefield with a charge counter on it for each time it was kicked. {T}: Add {C} for each charge counter on Everflowing Chalice.

When Experimental Synthesizer enters or leaves the battlefield, exile the top card of your library. Until end of turn, you may play that card. {2}{R}, Sacrifice Experimental Synthesizer: Create a 2/2 white Samurai creature token with vigilance. Activate only as a sorcery.

{T}: Add one mana of any color that a land an opponent controls could produce.

Fire Diamond enters the battlefield tapped. {T}: Add {R}.

Living weapon (When this Equipment enters the battlefield, create a 0/0 black Phyrexian Germ creature token, then attach this to it.) Equipped creature gets +1/+1. Equip {2}

When Ichor Wellspring enters the battlefield or is put into a graveyard from the battlefield, draw a card.

{R}, Sacrifice Implement of Combustion: It deals 1 damage to target player or planeswalker. When Implement of Combustion is put into a graveyard from the battlefield, draw a card.

Marble Diamond enters the battlefield tapped. {T}: Add {W}.

When Mycosynth Wellspring enters the battlefield or is put into a graveyard from the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

When Nimblewright Schematic enters the battlefield or is put into a graveyard from the battlefield, create a 1/1 colorless Construct artifact creature token.

When Prized Statue enters the battlefield or is put into a graveyard from the battlefield, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

{T}, Tap an untapped creature you control: Add one mana of any color.

{1}, Sacrifice a creature: Exile the top card of your library. You may play that card this turn. (You still pay its costs. You can play a land this way only if you have an available land play remaining.)

When Dawnbringer Cleric enters the battlefield, choose one — • Cure Wounds — You gain 2 life. • Dispel Magic — Destroy target enchantment. • Gentle Repose — Exile target card from a graveyard.

When Doomed Traveler dies, create a 1/1 white Spirit creature token with flying.

Sacrifice a Goblin: Regenerate target creature.

When Goblin Instigator enters the battlefield, create a 1/1 red Goblin creature token.

{R}, Sacrifice Goblin Legionnaire: It deals 2 damage to any target. {W}, Sacrifice Goblin Legionnaire: Prevent the next 2 damage that would be dealt to any target this turn.

When Goblin Matron enters the battlefield, you may search your library for a Goblin card, reveal that card, put it into your hand, then shuffle.

{T}: Add {W}.

First strike When Grim Initiate dies, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Haste When Harried Spearguard dies, create a 1/1 black Rat creature token with "This creature can't block."

Whenever another creature dies, you may have Hissing Iguanar deal 1 damage to target player or planeswalker.

When Hunted Witness dies, create a 1/1 white Soldier creature token with lifelink.

When Impulsive Pilferer dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") Encore {3}{R} ({3}{R}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

{T}: Add {R}.

Sacrifice Kami of False Hope: Prevent all combat damage that would be dealt this turn.

Sacrifice an artifact: Krark-Clan Shaman deals 1 damage to each creature without flying.

Echo {1}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When Mogg War Marshal enters the battlefield or dies, create a 1/1 red Goblin creature token.

When Novice Inspector enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

When Perilous Myr dies, it deals 2 damage to any target.

When Spirited Companion enters the battlefield, draw a card.

Whenever another creature enters the battlefield under your control, you may gain 1 life. Whenever a creature enters the battlefield under an opponent's control, you may have that player lose 1 life.

Target creature or planeswalker you control gains protection from colorless or from the color of your choice until end of turn. If it's a creature, put a +1/+1 counter on it. (It can't be blocked, targeted, dealt damage, enchanted, or equipped by anything with that quality.)

({W/P} can be paid with either {W} or 2 life.) Target artifact or creature you control gains protection from artifacts or from the color of your choice until end of turn.

Target permanent gains hexproof and indestructible until end of turn. If it's an artifact creature, it gets +2/+2 until end of turn.

As an additional cost to cast this spell, sacrifice a creature. Collateral Damage deals 3 damage to any target.

Changeling (This card is every creature type.) Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

Choose one — • Prevent all combat damage that would be dealt this turn. • Regenerate target creature. • Counter target spell that targets you.

As an additional cost to cast this spell, sacrifice an artifact or discard a card. Draw two cards.

Target creature you control gains protection from the color of your choice until end of turn. Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Target creature you control gains protection from the color of your choice until end of turn. (It can't be blocked, targeted, dealt damage, enchanted, or equipped by anything of that color.) Scry 1.

Lightning Bolt deals 3 damage to any target.

Create two 1/1 white Soldier creature tokens.

Populate. Creatures you control gain indestructible until end of turn. (To populate, create a token that's a copy of a creature token you control.)

Target creature gains protection from the color of your choice until end of turn.

{T}: Add {C}. Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Boros Garrison enters the battlefield tapped. When Boros Garrison enters the battlefield, return a land you control to its owner's hand. {T}: Add {R}{W}.

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

Indestructible {T}: Add {C}.

{T}: Add {R}.

({T}: Add {R}.)

({T}: Add {W}.)

As an additional cost to cast this spell, sacrifice a permanent. Exile target artifact, creature, or enchantment.

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. Create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this artifact: Draw a card.")

Flame Rift deals 4 damage to each player.

As an additional cost to cast this spell, sacrifice a creature. Reckless Abandon deals 4 damage to any target.

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

Return target artifact or creature card with mana value 3 or less from your graveyard to the battlefield. If a creature enters the battlefield this way, it enters with an additional +1/+1 counter on it.

Choose one or both — • Return target creature card from your graveyard to your hand. • Return target artifact card from your graveyard to your hand.

Return target creature card with mana value 3 or less from your graveyard to the battlefield. Create a Young Hero Role token attached to it. (Enchanted creature has "Whenever this creature attacks, if its toughness is 3 or less, put a +1/+1 counter on it." If you put another Role on the creature later, put this one into the graveyard.)

Create a 1/1 red Satyr creature token with "This creature can't block." Escape—{2}{R}, Exile two other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

This spell costs {3} less to cast if you control a creature with menace. Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.

{T}: Add {W}.

Create two 1/1 red Goblin creature tokens.

When Garrison Cat dies, create a 1/1 white Human Soldier creature token.

Target artifact or creature gains hexproof and indestructible until end of turn. Scry 1.

Prevent all damage that sources of the color of your choice would deal this turn. Flashback—Tap an untapped white creature you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Target player exiles a card from their graveyard. {1}, Exile Relic of Progenitus: Exile all graveyards. Draw a card.

While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able.

Terrarion enters the battlefield tapped. {2}, {T}, Sacrifice Terrarion: Add two mana in any combination of colors. When Terrarion is put into a graveyard from the battlefield, draw a card.

Sacrifice Benevolent Bodyguard: Target creature you control gains protection from the color of your choice until end of turn.

When Thraben Inspector enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")