Prossh, Skyraider of Kher
Legendary Creature — Dragon
When you cast this spell, create X 0/1 red Kobold creature tokens named Kobolds of Kher Keep, where X is the amount of mana spent to cast Prossh.
Flying
Sacrifice another creature: Prossh, Skyraider of Kher gets +1/+0 until end of turn.
イラスト：
Commander 2013 Oversized#204神話レア英語適正
裁定
The amount of mana you spent to cast this creature is usually equal to its converted mana cost. However, you also include any additional costs you pay, including the commander tax.
You can’t choose to pay extra mana to cast a creature spell unless something instructs you to.
The first ability triggers when you cast Prossh, not when it enters the battlefield. This means that it will resolve before Prossh, so any Kobold tokens it creates will be put onto the battlefield before Prossh. If Prossh enters the battlefield without being cast, the ability will not trigger.