腐食の荒馬 {1}{B}

クリーチャー — 蛇・馬・乗騎

腐食の荒馬が攻撃するたび、あなたのライブラリーの一番上にあるカード１枚を公開し、あなたの手札に加える。腐食の荒馬が騎乗された状態でないなら、あなたはそのカードのマナ総量に等しい点数のライフを失う。騎乗された状態なら、各対戦相手はそれぞれそのカードのマナ総量に等しい点数のライフを失う。

騎乗3（あなたがコントロールしていてこれでない望む数のクリーチャーをパワーの合計が3以上になるように選び、タップする：ターン終了時まで、この乗騎は騎乗された状態になる。騎乗はソーサリーとしてのみ行う。）

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Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
If the revealed card doesn’t have a mana cost (because it’s a land card, for example), its mana value is 0. (2024-04-12)
If the revealed card’s mana cost includes {X}, X is 0 for the purpose of determining its mana value. (2024-04-12)
If the revealed card is a split card, that card’s mana value is based on the combined mana cost of its two halves. (2024-04-12)
If Caustic Bronco isn’t on the battlefield as its triggered ability resolves, use whether it was saddled or not before it left the battlefield to determine who loses life. (2024-04-12)
“Saddle N” means “Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery.” (2024-04-12)

“Saddled” isn’t an ability that a creature has. It’s just something true about that creature. It won’t stop being saddled until the turn ends or it leaves the battlefield. (2024-04-12)
Creatures with saddle can attack or block as normal even if they aren’t saddled. (2024-04-12)
If a permanent becomes a copy of a saddled Mount, the copy won’t be saddled. (2024-04-12)
You may activate a permanent’s saddle ability even if that permanent is already saddled. (2024-04-12)
An ability that triggers when a creature “attacks while saddled” will trigger only if that creature was saddled when it was declared as an attacker. (2024-04-12)