Name: Contamination Cost: 2B Type: Enchantment Rules Text: At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a creature. If a land is tapped for mana, it produces {B} instead of any other type and amount. Set/Rarity: Urza's Saga rare, The List rare, Mystery Booster 2 rare Price: $3.94

Name: Contemplation Cost: 1WW Type: Enchantment Rules Text: Whenever you cast a spell, you gain 1 life. Set/Rarity: Stronghold uncommon Price: $0.25

Name: Contested Game Ball Cost: 2 Type: Artifact Rules Text: Whenever you're dealt combat damage, the attacking player gains control of this artifact and untaps it. {2}, {T}: Draw a card and put a point counter on this artifact. Then if it has five or more point counters on it, sacrifice it and create a Treasure token. Set/Rarity: The Lost Caverns of Ixalan uncommon Price: $0.07

Name: Contested War Zone Type: Land Rules Text: Whenever a creature deals combat damage to you, that creature's controller gains control of this land. {T}: Add {C}. {1}, {T}: Attacking creatures get +1/+0 until end of turn. Set/Rarity: Mirrodin Besieged rare, Edge of Eternities: Stellar Sights rare Price: $0.28

Name: Contortionist Otter Storm Type: Stickers Rules Text: {TK}{TK} -- {T}: Target creature gains haste until end of turn. {TK}{TK}{TK}{TK} -- Deathtouch, lifelink {TK}{TK} -- 5/1 {TK}{TK}{TK} -- 3/5 Set/Rarity: Unfinity Sticker Sheets common Price: $0.19

Name: Contraband Livestock Cost: 1W Type: Instant Rules Text: Exile target creature, then roll a d20. 1--9 | Its controller creates a 4/4 green Ox creature token. 10--19 | Its controller creates a 2/2 green Boar creature token. 20 | Its controller creates a 0/1 white Goat creature token. Set/Rarity: The List uncommon, Commander Legends: Battle for Baldur's Gate uncommon Price: $0.22

Name: Contract Killing Cost: 3BB Type: Sorcery Rules Text: Destroy target creature. Create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.") Set/Rarity: Ixalan common, Foundations Jumpstart common Price: $0.04

Name: Contractual Safeguard Cost: 2W Type: Instant Rules Text: Addendum -- If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control. Set/Rarity: New Capenna Commander rare, New Capenna Commander Promos rare Price: $1.21

Name: Convalescence Cost: 1W Type: Enchantment Rules Text: At the beginning of your upkeep, if you have 10 or less life, you gain 1 life. Set/Rarity: Exodus rare Price: $0.32

Name: Convalescent Care Cost: 1WW Type: Enchantment Rules Text: At the beginning of your upkeep, if you have 5 or less life, you gain 3 life and draw a card. Set/Rarity: Onslaught rare Price: $0.41

Name: Convergence of Dominion Cost: 3 Type: Artifact Rules Text: Dynastic Command Node -- As long as you control your commander, activated abilities of cards in your graveyard cost {2} less to activate. This effect can't reduce the mana in that ability's activation cost to less than one mana. Translocation Protocols -- {3}, {T}: Mill three cards. Set/Rarity: Warhammer 40,000 Commander rare Price: $0.74

Name: Conversion Cost: 2WW Type: Enchantment Rules Text: At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}. All Mountains are Plains. Set/Rarity: Limited Edition Alpha uncommon, Limited Edition Beta uncommon, Unlimited Edition uncommon, Intl. Collectors' Edition uncommon, Collectors' Edition uncommon, Revised Edition uncommon, Foreign Black Border uncommon, Summer Magic / Edgar uncommon, Fourth Edition Foreign Black Border uncommon, Fourth Edition uncommon, Masters Edition IV rare, 30th Anniversary Edition uncommon Price: $0.21

Name: Conversion Apparatus Cost: 3 Type: Artifact Rules Text: {T}: Add {C}. {3}, {T}: You get {E}{E}{E} (three energy counters). {T}, Pay {E}{E}{E}: Add three mana in any combination of colors. Set/Rarity: Modern Horizons 3 Commander rare Price: $0.16

Name: Conversion Chamber Cost: 3 Type: Artifact Rules Text: {2}, {T}: Exile target artifact card from a graveyard. Put a charge counter on this artifact. {2}, {T}, Remove a charge counter from this artifact: Create a 3/3 colorless Phyrexian Golem artifact creature token. Set/Rarity: New Phyrexia uncommon Price: $0.18

Name: Conviction Cost: 1W Type: Enchantment -- Aura Rules Text: Enchant creature Enchanted creature gets +1/+3. {W}: Return this Aura to its owner's hand. Set/Rarity: Stronghold common, Tempest Remastered common, Aether Revolt common, Ultimate Masters common, The List common, Kaladesh Remastered common Price: $0.05

Name: Cooking Campsite Type: Land Rules Text: {T}: Add {W}. {3}, {T}, Sacrifice an artifact: Put a +1/+1 counter on each creature you control. Activate only as a sorcery. [Back face. Transforms from Sidequest: Catch a Fish.] Set/Rarity: Final Fantasy uncommon Price: $0.11

Name: Cool Fluffy Loxodon Type: Stickers Rules Text: {TK}{TK} -- When this permanent leaves the battlefield, draw a card. {TK}{TK}{TK}{TK}{TK} -- Whenever a creature enters under your control, this permanent becomes a 13/13 Eldrazi creature in addition to its other types until end of turn. {TK}{TK} -- 4/2 {TK}{TK}{TK}{TK} -- 5/6 Set/Rarity: Unfinity Sticker Sheets common Price: $0.21

Name: Cooped Up Cost: 1W Type: Enchantment -- Aura Rules Text: Enchant creature Enchanted creature can't attack or block. {2}{W}: Exile enchanted creature. Set/Rarity: Wilds of Eldraine common Price: $0.06

Name: Cooperation Cost: 2W Type: Enchantment -- Aura Rules Text: Enchant creature Enchanted creature has banding. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding a player controls are blocking or being blocked by a creature, that player divides that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.) Set/Rarity: Ice Age common Price: $0.18

Name: Coordinated Barrage Cost: W Type: Instant Rules Text: Choose a creature type. Coordinated Barrage deals damage to target attacking or blocking creature equal to the number of permanents you control of the chosen type. Set/Rarity: Morningtide common Price: $0.23