Spells and abilities your opponents control can't cause their controller to search their library. −1: Target player mills four cards. Then exile each opponent's graveyard.

Choose any number of target creatures. Each of those creatures gains persist until end of turn. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Counter target spell.

This spell can't be countered. Counter target noncreature spell.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Whenever a creature deals damage to you, destroy it. When Dread is put into a graveyard from anywhere, shuffle it into its owner's library.

Exile target creature you control, then return it to the battlefield under its owner's control. Flashback {3}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Each player sacrifices all permanents they control that are one or more colors.

Destroy target creature. A creature destroyed this way can't be regenerated. Overload {2}{W}{W} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Choose two — • Put two +1/+1 counters on up to one creature. It gains lifelink until end of turn. • Destroy each creature with power 2 or less. • Return up to two creature cards from your graveyard to your hand. • Each opponent sacrifices a creature with the highest power among creatures they control.

Choose three. You may choose the same mode more than once. • Until end of turn, target creature loses all abilities and has base power and toughness 1/1. • Target creature connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.) • Target player returns a creature card from their graveyard to their hand.

Exile target artifact or enchantment. If you cast this spell during your main phase, you may exile up to one other target artifact or enchantment.

{T}, Sacrifice this artifact: Destroy all permanents except for artifacts and lands. Activate only during your upkeep.

This spell can't be countered. Destroy all creatures.

When this enchantment enters, exile up to one target artifact or creature until this enchantment leaves the battlefield. Channel — {1}{W}, Discard this card: Exile target artifact or creature. Return it to the battlefield under its owner's control at the beginning of the next end step.

Destroy target permanent.

You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.

Each player loses X life, discards X cards, sacrifices X creatures of their choice, then sacrifices X lands of their choice.

Whenever one or more creatures attack, you may have target attacking creature gain double strike until end of turn.

Draw cards equal to the number of cards in your library, then put a card from your hand on top of your library. You have no maximum hand size until your next turn.

Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn."

Flying Whenever this creature deals combat damage to a player, choose a card in your hand. That player guesses whether the card's mana value is greater than 4. If the player guessed wrong, you may cast the card without paying its mana cost.

Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on each artifact that became a creature this way. Overload {4}{U}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

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

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

At the beginning of each player's first main phase, if this artifact is untapped, that player adds {C} for each artifact they control.

{T}: Add one mana of any color. {T}: Put a charge counter on this artifact. At the beginning of your first main phase, remove all charge counters from this artifact. Add one mana of any color for each charge counter removed this way.

{T}: Add one mana of any color in your commander's color identity. Sacrifice this artifact: Draw a card.

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

Nonartifact spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you tap after you're done activating mana abilities pays for {1}.)

{T}: Add {C}. {T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

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

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

{T}: Add {C}. {T}: Add {U} or {B}. This artifact deals 1 damage to you.

{T}: Add {C}. {T}: Add {W} or {B}. This artifact deals 1 damage to you.

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Menace When God-Eternal Bontu enters, sacrifice any number of other permanents, then draw that many cards. When God-Eternal Bontu dies or is put into exile from the battlefield, you may put it into its owner's library third from the top.

{T}, Sacrifice three other artifacts and/or creatures: Look at the top three cards of your library. Put two of them into your hand and the other into your graveyard. Partner (You can have two commanders if both have partner.)

Counter target spell unless its controller discards their hand. Transmute {1}{U}{B} ({1}{U}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Flying As long as you control four or more artifacts, this creature has hexproof. (It can't be the target of spells or abilities your opponents control.) Tap two untapped artifacts you control: Draw a card.

Flying Whenever an artifact you control enters, you may draw a card. If you do, discard a card.

{1}: You may cast target creature card in a graveyard this turn. When you cast it this turn, this creature gains all activated abilities of that card until end of turn.

Search target opponent's library for a card and exile it face down. Then that player shuffles. You may play that card for as long as it remains exiled.

Commander creatures you own have "Whenever an artifact or creature you control is put into a graveyard from the battlefield, each opponent loses 1 life."

Lifelink Whenever an artifact you control enters, scry 1.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Ward {4} Whenever this creature or another artifact you control enters, put a +1/+1 counter on this creature and it can't be blocked this turn.

Whenever an artifact enters, you may gain 1 life.

At the beginning of your upkeep, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") {T}, Sacrifice three Clues: Search your library for a card, put that card into your hand, then shuffle.

{T}: Add {C}. {T}: Add {W} or {U}. This land deals 1 damage to you.

This land enters tapped. {T}: Add {W}, {U}, or {B}.

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {W}{U}.

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

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

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

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {U}{B}.

When this land enters, sacrifice it unless you return a non-Lair land you control to its owner's hand. {T}: Add {W}, {U}, or {B}.

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

{T}: Add one mana of any color. Whenever you tap this land for mana, target opponent creates a 1/1 colorless Spirit creature token.

This land enters tapped unless you control a Plains or an Island. {T}: Add {W} or {U}.

At the beginning of the end step, if you control no artifacts, sacrifice this land. {T}: Add one mana of any color.

This land enters tapped. {T}: Add {C}. {T}: Add one mana of any color. This land deals 1 damage to you.

({T}: Add {U}.)

When this land enters, sacrifice it. When you do, search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {W}{B}.

This land enters tapped. {T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

({T}: Add {W}.)

({T}: Add {B}.)

This land enters tapped. When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.) {T}: Add {U} or {B}.

This land enters tapped. When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.) {T}: Add {W} or {U}.

If you would create a Clue, Food, or Treasure token, instead create one of each.

Avoidance — Whenever you cast a noncreature spell, exile up to one target nonland permanent you control, then return that card to the battlefield under its owner's control.

Equipped creature has double strike. (It deals both first-strike and regular combat damage.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

+1: Creatures you control gain deathtouch until end of turn. Put a +1/+1 counter on up to one target creature token you control. −2: Until end of turn, if one or more tokens would be created under your control, twice that many of those tokens are created instead. −6: Exile all cards from all graveyards, then create a 1/1 white Spirit creature token with flying for each card exiled this way.

Indestructible As long as your devotion to blue is less than five, Thassa isn't a creature. At the beginning of your end step, exile up to one other target creature you control, then return that card to the battlefield under your control. {3}{U}: Tap another target creature.