Equipped creature gets +1/+0 for each opponent you have. Whenever equipped creature is dealt damage, it deals that much damage to any target. Equip {4}

When Cryptic Coat enters the battlefield, cloak the top card of your library, then attach Cryptic Coat to it. (To cloak a card, put it onto the battlefield face down as a 2/2 creature with ward {2}. Turn it face up any time for its mana cost if it's a creature card.) Equipped creature gets +1/+0 and can't be blocked. {1}{U}: Return Cryptic Coat to its owner's hand.

Flash This spell costs {1} less to cast for each attacking creature you control. When Embercleave enters the battlefield, attach it to target creature you control. Equipped creature gets +1/+1 and has double strike and trample. Equip {3}

Equipped creature gets +2/+0 and has reach. Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker. Equip {2}{R}

For Mirrodin! (When this Equipment enters the battlefield, create a 2/2 red Rebel creature token, then attach this to it.) Equipped creature gets +2/+2. Whenever equipped creature attacks, if it's the first combat phase of the turn, untap each attacking creature. After this phase, there is an additional combat phase. Equip {3}{R}

Equipped creature gets +2/+0. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

As long as it's your turn, equipped creature gets +1/+0 and has first strike. {2}, Sacrifice Knife: Draw a card. Equip {2}

Menace Equipped creature gets +2/+2 and has menace. Whenever Komainu Battle Armor or equipped creature deals combat damage to a player, goad each creature that player controls. Reconfigure {4} ({4}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Double strike Equipped creature has double strike. Reconfigure {2} ({2}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Equipped creature gets +1/+1 and has "Whenever this creature attacks, draw a card, then discard a card." Equip Pirate {1} Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Invoke Duplicity — Equipped creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may sacrifice Trickster's Talisman. If you do, create a token that's a copy of this creature." Equip {2}

Choose one — • Abrade deals 3 damage to target creature. • Destroy target artifact.

This spell costs {1} less to cast for each creature on the battlefield. Blasphemous Act deals 13 damage to each creature.

Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

Counter target spell.

Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.) Channel — {2}{U}, Discard Mirrorshell Crab: Counter target spell or ability unless its controller pays {3}.

Counter target noncreature spell.

Target creature you control gets +1/+1 and gains hexproof until end of turn. Untap it. (It can't be the target of spells or abilities your opponents control.)

Spells your opponents cast that target Charix, the Raging Isle cost {2} more to cast. {3}: Charix gets +X/-X until end of turn, where X is the number of Islands you control.

Flash

Create a 0/3 blue Crab creature token. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Landfall — Whenever a land enters the battlefield under your control, target player mills three cards.

Homarid enters the battlefield with a tide counter on it. At the beginning of your upkeep, put a tide counter on Homarid. As long as there is exactly one tide counter on Homarid, it gets -1/-1. As long as there are exactly three tide counters on Homarid, it gets +1/+1. Whenever there are four or more tide counters on Homarid, remove all tide counters from it.

{1}{U}{U}, Sacrifice a blue creature: Create X 1/1 blue Camarid creature tokens, where X is the sacrificed creature's mana value.

{U}: Untap Horseshoe Crab.

When Purple-Crystal Crab dies, draw a card.

Landfall — Whenever a land enters the battlefield under your control, each opponent mills three cards. (To mill a card, a player puts the top card of their library into their graveyard.)

As Sarpadian Empires, Vol. VII enters the battlefield, choose white Citizen, blue Camarid, black Thrull, red Goblin, or green Saproling. {3}, {T}: Create a 1/1 creature token of the chosen color and type.

{1}, Discard a card: Create a 0/3 blue Crab creature token. Delirium — Crabs you control get +1/+1 as long as there are four or more card types among cards in your graveyard.

{6}{U}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.) As long as Skittering Crustacean is monstrous, it has hexproof. (It can't be the target of spells or abilities your opponents control.)

{U}: Viscerid Deepwalker gets +1/+0 until end of turn. Suspend 4—{U} (Rather than cast this card from your hand, you may pay {U} and exile it with four time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

Whenever Acquisition Octopus or equipped creature deals combat damage to a player, draw a card. Reconfigure {2} ({2}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Equipped creature gets +1/+1 and has "Whenever this creature attacks, surveil 2." (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) {2}, Sacrifice Candlestick: Draw a card. Equip {2}

Draw two cards. Then discard a card unless you attacked this turn.

Look at the top three cards of your library. Put one of them into your hand, put one of them on the bottom of your library, and exile one of them. You may play the exiled card this turn.

Whenever you cast an artifact spell, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") Activated abilities of artifacts you control cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana.

Whenever equipped creature deals combat damage to a player, it connives X, where X is the amount of damage it dealt to that player. (Draw X cards, then discard X cards. Put a +1/+1 counter on that creature for each nonland card discarded this way.) Equip {2}

Vigilance When Mirelurk Queen enters the battlefield, target player gets two rad counters. Whenever one or more nonland cards are milled, draw a card, then put a +1/+1 counter on Mirelurk Queen. This ability triggers only once each turn.

When equipped creature deals combat damage to a player, sacrifice Mystery Key. If you do, draw three cards. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Enchant opponent Skip your draw step. Whenever enchanted opponent draws a card, you may draw a card.

Whenever equipped creature deals combat damage to a player, you draw that many cards. Equip {4} Equip Shaman, Warlock, or Wizard {1}

You may look at the top card of your library any time. As long as The Reality Chip is attached to a creature, you may play lands and cast spells from the top of your library. Reconfigure {2}{U} ({2}{U}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

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

As Frostboil Snarl enters the battlefield, you may reveal an Island or Mountain card from your hand. If you don't, Frostboil Snarl enters the battlefield tapped. {T}: Add {U} or {R}.

({T}: Add {U}.)

({T}: Add {R}.)

Myriad Landscape enters the battlefield tapped. {T}: Add {C}. {2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

{T}: Add {C}. {T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.

Sulfur Falls enters the battlefield tapped unless you control an Island or a Mountain. {T}: Add {U} or {R}.

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

Equipped creature gets +1/+0 and has menace. (It can't be blocked except by two or more creatures.) Whenever equipped creature deals combat damage to a player or battle, create a Treasure token. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

{T}: Add {C}{C}. Spend this mana only to cast artifact spells or activate abilities of artifacts. Equipped creatures you control have flying and haste.

Indestructible (Effects that say "destroy" don't destroy this artifact.) Equipped creature gets +1/+1 and has "Whenever this creature attacks, create a Treasure token." (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") Equip {2}

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

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

{T}: Add one mana of any color. {1}, {T}: Untap target legendary creature you control.

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

Equipped creature gets +1/+1 and has trample and "Whenever this creature deals combat damage to a player or planeswalker, create that many Treasure tokens." Equip {3}