Whenever one or more creatures you control deal combat damage to a player, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") {1}{G}, Exile a creature card from your graveyard: Investigate. You gain 2 life.

The first activated ability of an artifact you activate each turn costs {2} less to activate. +1: Draw two cards. Then discard two cards unless you discard an artifact card. −2: Target artifact becomes an artifact creature. If it isn't a Vehicle, it has base power and toughness 4/4. −6: You get an emblem with "Whenever an artifact you control becomes tapped, draw a card."

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

({T}: Add {G}.)

({T}: Add {U}.)

This land enters tapped. Indestructible {T}: Add {G} or {U}.

When this Equipment enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach this Equipment to it. Whenever equipped creature attacks, double the number of +1/+1 counters on it. Equip {2}

{8}, {T}: Search your library for a permanent card, put it onto the battlefield, then shuffle.

Equipped creature has vigilance. Whenever another artifact or creature is put into a graveyard from the battlefield, put a +1/+1 counter on equipped creature. Equip {2}

Commander creatures you own have "{2}, Sacrifice an artifact: Put a +1/+1 counter on this creature and draw a card."

Enchant creature At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.

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

Five Hundred Year Diary enters tapped. {T}: Add {U} for each Clue you control. {2}, Sacrifice Five Hundred Year Diary: Draw a card.

Draw a card. You may put a land card from your hand onto the battlefield.

Copy target creature spell you control, except it isn't legendary if the spell is legendary. (A copy of a creature spell becomes a token.)

Counter target spell.

Destroy target creature. It can't be regenerated. That creature's controller creates a 3/3 green Frog Lizard creature token.

Move any number of +1/+1 counters from target creature onto another target creature with the same controller.

Backup 1, backup 1, backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following abilities until end of turn. Each backup ability triggers separately.) Trample Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it.

Whenever a player casts a spell, you may put a +1/+1 counter on this creature. At the beginning of your upkeep, you may move any number of +1/+1 counters from this creature onto other creatures.

Enchant creature When this Aura enters, put a +1/+1 counter on enchanted creature. At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.

{1}{G}{U}: Put a +1/+1 counter on target creature you control. Whenever one or more +1/+1 counters are put on a creature you control, put that many growth counters on this enchantment. At the beginning of your upkeep, if this enchantment has twenty or more growth counters on it, you win the game.

Flying, trample When Tanazir Quandrix enters, double the number of +1/+1 counters on target creature you control. Whenever Tanazir Quandrix attacks, you may have the base power and toughness of other creatures you control become equal to Tanazir Quandrix's power and toughness until end of turn.

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

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

Indestructible (Effects that say "destroy" don't destroy this artifact.) {T}: Add one mana of any color.

{T}: Draw a card. Activate only if you created a token this turn. {8}, {T}, Sacrifice this artifact: Create a 10/10 colorless Eldrazi creature token.

If one or more +1/+1 counters would be put on a permanent you control, that many plus one +1/+1 counters are put on that permanent instead. {T}: Add X mana of any one color, where X is this creature's power.

Trample Whenever a player casts a spell, put a +1/+1 counter on this creature.

Counter target noncreature spell.

If one or more tokens would be created under your control, those tokens plus an additional Food token are created instead. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.") Sacrifice three Foods: Draw a card.

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

You have no maximum hand size. {T}: Add {C}.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

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

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.")

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

Gathered Swarm — Whenever one or more tokens you control enter, put a +1/+1 counter on this creature.

Flying Other artifact creatures you control have flying. When this creature enters, until end of turn, each noncreature artifact you control becomes an artifact creature with base power and toughness 4/4.

Whenever Emissary Green attacks, starting with you, each player votes for profit or security. You create a number of Treasure tokens equal to twice the number of profit votes. Put a number of +1/+1 counters on each creature you control equal to the number of security votes.

Echo {4} (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.) Sacrifice an artifact: Put a +1/+1 counter on target creature.

Whenever you sacrifice a Clue, you gain 3 life.

Affinity for tokens (This spell costs {1} less to cast for each token you control.) Whenever a token you control enters, tap target nonland permanent an opponent controls. It doesn't untap during its controller's next untap step.

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 another nontoken creature you control enters, investigate. {T}, Sacrifice X Clues: Target opponent reveals the top X cards of their library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield under your control. That player puts the rest on the bottom of their library in a random order.

You have no maximum hand size. Sonic Booster — Whenever Nyssa of Traken attacks, sacrifice any number of artifacts. When you sacrifice one or more artifacts this way, tap up to that many target creatures and draw that many cards. Doctor's companion (You can have two commanders if the other is the Doctor.)

{T}, Sacrifice an artifact: Draw a card.

Whenever an artifact you control enters, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard.

Artifacts you control are Clues in addition to their other types and have "{2}, Sacrifice this artifact: Draw a card." Whenever you sacrifice a Clue, target creature can't be blocked this turn.

Trample The Third Doctor gets +1/+1 for each noncreature token you control. When The Third Doctor enters, create your choice of a Clue token, a Food token, or a Treasure token.

Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature.

Put a +1/+1 counter on target creature you control. It gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Counter target artifact, creature, or planeswalker spell. Its controller creates a 2/2 blue Bird creature token with flying.