Counterbalance MB2

Card

id	51518
artist	John Zeleznik
artistIds	7d96bd59-7779-4740-8658-953f518ff805
asciiName
attractionLights
availability	mtgo, paper
boosterTypes
borderColor	black
colorIdentity	U
colorIndicator
colors	U
defense
duelDeck
edhrecRank	2734
edhrecSaltiness	1.31
faceConvertedManaCost
faceFlavorName
faceManaValue
faceName
finishes	nonfoil, foil
flavorName
flavorText
frameEffects
frameVersion	future
hand
hasAlternativeDeckLimit
hasContentWarning
hasFoil	1
hasNonFoil	1
isAlternative
isFullArt
isFunny
isGameChanger
isOnlineOnly
isOversized
isPromo
isRebalanced
isReprint	1
isReserved
isStarter	1
isStorySpotlight
isTextless
isTimeshifted	1
keywords
language	English
layout	normal
leadershipSkills
life
loyalty
manaCost	{U}{U}
manaValue	2
name	Counterbalance
number	157
originalPrintings
originalReleaseDate
originalText	Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card.
otherFaceIds
power
printings	CSP, MB2, MP2, PLST, SLD
promoTypes
rarity	uncommon
rebalancedPrintings
relatedCards
securityStamp
setCode	MB2
side
signature
sourceProducts	{'foil': ['1db93605-0a4e-5e5b-80a2-18a6e177f51d'], 'nonfoil': ['1db93605-0a4e-5e5b-80a2-18a6e177f51d']}
subsets
subtypes
supertypes
text	Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card.
toughness
type	Enchantment
types	Enchantment
uuid	91e60404-5d00-52f6-958d-54c2686d67ef
variations
watermark
setName	Mystery Booster 2

id	51518
cardKingdom	https://mtgjson.com/links/edcab3cc56f1c617
cardKingdomEtched
cardKingdomFoil	https://mtgjson.com/links/88b27062b18c4327
cardmarket	https://mtgjson.com/links/b878af792365e278
tcgplayer	https://mtgjson.com/links/b02f59f99ac89072
tcgplayerEtched
uuid	91e60404-5d00-52f6-958d-54c2686d67ef

No foreign data.

date	text
2006-07-15	If an opponent casts a spell with X in its mana cost, the mana value of that spell takes the value of X into account. If you reveal a card with X in its mana cost, X is 0. For example, if your opponent casts Blaze with X=1, Counterbalance will counter that spell if you reveal a card with mana value 2, but it won't counter that spell if you reveal a Blaze of your own.
2017-04-18	If an opponent casts half of a split card (for example, Hit), it won't be countered if you reveal that same split card. The mana value of a split card is determined by the combined mana cost of its two halves, but the mana value of Hit is determined using only that half's mana cost.