Copper Tablet

Artifact

At the beginning of each player's upkeep, Copper Tablet deals 1 damage to that player.

Coretapper

Artifact Creature — Myr (1/1)

: Put a charge counter on target artifact.
Sacrifice Coretapper: Put two charge counters on target artifact.

Corrupted Grafstone

Artifact

Corrupted Grafstone enters the battlefield tapped.
: Choose a color of a card in your graveyard. Add one mana of that color.

Cranial Archive

Artifact

, Exile Cranial Archive: Target player shuffles their graveyard into their library. Draw a card.

Cranial Plating

Artifact — Equipment

Equipped creature gets +1/+0 for each artifact you control.
: Attach Cranial Plating to target creature you control.
Equip

Crashing Drawbridge

Artifact Creature — Wall (0/4)

Defender
: Creatures you control gain haste until end of turn.

Credit Voucher

Artifact

, , Sacrifice Credit Voucher: Shuffle any number of cards from your hand into your library, then draw that many cards.

Crook of Condemnation

Artifact

, : Exile target card from a graveyard.
, Exile Crook of Condemnation: Exile all graveyards.

Crown of Convergence

Artifact

Play with the top card of your library revealed.
As long as the top card of your library is a creature card, creatures you control that share a color with that card get +1/+1.
: Put the top card of your library on the bottom of your library.

Crown of Empires

Artifact

, : Tap target creature. Gain control of that creature instead if you control artifacts named Scepter of Empires and Throne of Empires.

Crown of the Ages

Artifact

, : Attach target Aura attached to a creature to another creature.

Culling Dais

Artifact

, Sacrifice a creature: Put a charge counter on Culling Dais.
, Sacrifice Culling Dais: Draw a card for each charge counter on Culling Dais.

Cultist's Staff

Artifact — Equipment

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

Curious Killbot

Artifact Creature — Killbot (2/1)

Cursed Totem

Artifact

Activated abilities of creatures can't be activated.

Cyberman Patrol

Artifact Creature — Cyberman (2/2)

Artifact creatures you control have afflict 3. (Whenever a creature with afflict 3 becomes blocked, defending player loses 3 life.)

Cybermat

Artifact Creature — Robot (2/1)

Skulk (This creature can't be blocked by creatures with greater power.)
Whenever Cybermat attacks and isn't blocked, it gets +X/+0 until end of turn, where X is the number of attacking artifact creatures.

Dagger of the Worthy

Artifact — Equipment

Equipped creature gets +2/+0 and has afflict 1. (Whenever it becomes blocked, defending player loses 1 life.)
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Darksteel Brute

Artifact

Indestructible (Damage and effects that say "destroy" don't destroy this artifact.)
: Darksteel Brute becomes a 2/2 Beast artifact creature until end of turn.

Darksteel Garrison

Artifact — Fortification

Fortified land has indestructible.
Whenever fortified land becomes tapped, target creature gets +1/+1 until end of turn.
Fortify (: Attach to target land you control. Fortify only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the land leaves.)