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17 May 2024: Card library updated.

Opal Guardian

WWW · Enchantment

When an opponent casts a creature spell, if Opal Guardian is an enchantment, Opal Guardian becomes a 3/4 Gargoyle creature with flying and protection from red.

Similar cards

Color identity:
NameManaTypeText
When 2UInstant Counter target creature spell.
Double Major GUInstant 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.)
Wake the Dragon 4BRSorcery Create a 6/6 black and red Dragon creature token with flying, menace, and "Whenever this creature deals combat damage to a player, gain control of target artifact that player controls." Flashback {6}{B}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Bird Maiden 2RCreature — Human Bird Flying 1/2
Intrepid Paleontologist 1GCreature — Human Druid {T}: Add one mana of any color. {2}: Exile target card from a graveyard. You may cast Dinosaur creature spells from among cards you own exiled with Intrepid Paleontologist. If you cast a spell this way, that creature enters the battlefield with a finality counter on it. (If a creature with a finality counter on it would die, exile it instead.) 2/2
Gwenna, Eyes of Gaea 2GLegendary Creature — Elf Druid Scout {T}: Add two mana in any combination of colors. Spend this mana only to cast creature spells or activate abilities of a creature or creature card. Whenever you cast a creature spell with power 5 or greater, put a +1/+1 counter on Gwenna, Eyes of Gaea and untap it. 2/3
Kozilek's Sentinel 1RCreature — Eldrazi Drone Devoid (This card has no color.) Whenever you cast a colorless spell, Kozilek's Sentinel gets +1/+0 until end of turn. 1/4
Kozilek's Unsealing 2UEnchantment Devoid (This card has no color.) Whenever you cast a creature spell with mana value 4, 5, or 6, create two 0/1 colorless Eldrazi Spawn creature tokens with "Sacrifice this creature: Add {C}." Whenever you cast a creature spell with mana value 7 or greater, draw three cards.
Inspired Sprite 3UCreature — Faerie Wizard Flash Flying Whenever you cast a Wizard spell, you may untap Inspired Sprite. {T}: Draw a card, then discard a card. 2/2
Twinning Glass 4Artifact {1}, {T}: You may cast a spell from your hand without paying its mana cost if it has the same name as a spell that was cast this turn.
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