挑発の咆哮
ソーサリー
クリーチャー１体を対象とする。このターン、それをブロックできるすべてのクリーチャーは、それをブロックする。
獰猛 ― あなたがパワーが４以上であるクリーチャーをコントロールしているなら、ターン終了時まで、その対象としたクリーチャーは破壊不能を得る。（ダメージや「破壊」と書かれた効果では、それは破壊されない。）
イラスト：
Jumpstart 2022#720アンコモン日本語適正
裁定
If, during the declare blockers step, a creature is tapped or is affected by a spell or ability that says it can’t block, then it doesn’t block. If there’s a cost associated with having that creature block, its controller isn’t forced to pay that cost. If the player doesn’t, the creature doesn’t block in that case either.
Roar of Challenge doesn’t give any creatures the ability to block the target creature. It just forces those creatures that are already able to block the creature to do so.
Some ferocious abilities that appear on instants and sorceries use the word “instead.” These spells have an upgraded effect if you control a creature with power 4 or greater as they resolve. For these, you only get the upgraded effect, not both effects.
Ferocious abilities of instants and sorceries that don’t use the word “instead” will provide an additional effect if you control a creature with power 4 or greater as they resolve.