Card Codex

M:tG card similarity search

17 May 2024: Card library updated.

Horizon Stone

5 · Artifact

If you would lose unspent mana, that mana becomes colorless instead.

Similar cards

Color identity:
NameManaTypeText
Omnath, Locus of Mana 2GLegendary Creature — Elemental You don't lose unspent green mana as steps and phases end. Omnath, Locus of Mana gets +1/+1 for each unspent green mana you have. 1/1
Ixalli's Lorekeeper GCreature — Human Druid {T}: Add one mana of any color. Spend this mana only to cast a Dinosaur spell or activate an ability of a Dinosaur source. 1/1
Pirate's Landing RSorcery Draw a card. If mana from a Treasure was spent to cast this spell, seek a Pirate card instead.
Toxicrene 3GCreature — Tyranid Reach, deathtouch Hypertoxic Miasma — All lands have "{T}: Add one mana of any color" and lose all other abilities. 2/4
Humble Naturalist 1GCreature — Human Druid {T}: Add one mana of any color. Spend this mana only to cast a creature spell. 1/3
Sinner's Judgment Enchantment — Aura Curse Enchant player At the beginning of your upkeep, put a judgment counter on Sinner's Judgment. Then if there are three or more judgment counters on it, enchanted player loses the game. If Sinner's Judgment would be put into a graveyard from anywhere, exile it instead.
Marvo, Deep Operative 3UBLegendary Creature — Octopus Rogue Whenever Marvo, Deep Operative attacks, clash with defending player. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.) Whenever you win a clash, draw a card. Then you may cast a spell from your hand with mana value 8 or less without paying its mana cost. 1/8
Draugr Necromancer 3BSnow Creature — Zombie Cleric If a nontoken creature an opponent controls would die, exile that card with an ice counter on it instead. You may cast spells from among cards in exile your opponents own with ice counters on them, and you may spend mana from snow sources as though it were mana of any color to cast those spells. 4/4
Pygmy Hippo GUCreature — Hippo Whenever Pygmy Hippo attacks and isn't blocked, you may have defending player activate a mana ability of each land they control and lose all unspent mana. If you do, Pygmy Hippo assigns no combat damage this turn and at the beginning of your next main phase this turn, you add an amount of {C} equal to the amount of mana that player lost this way. 2/2
Piracy UUSorcery Until end of turn, you may tap lands you don't control for mana. Spend this mana only to cast spells.
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