両生共生体

Text:

あなたがクリーチャー・呪文を唱えるためのコストは、それが変容を持っているなら、少なくなる。
あなたがクリーチャー・呪文を唱えるたび、それが変容を持っている場合、カードを１枚引き、その後カード１枚を捨てる。

Rulings:

• 4/17/2020 Pollywog Symbiote’s first ability applies to creature spells you cast that have mutate even if you don’t cast them for their mutate cost. Similarly, its second ability triggers even if the creature spell with mutate was cast for a cost other than its mutate cost.
• 4/17/2020 Effects that reduce the generic mana cost of a spell (such as that of Pollywog Symbiote) can’t reduce that spell’s colored mana requirements.
• 4/17/2020 An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
• 4/17/2020 Players can cast spells and activate abilities after the triggered ability resolves but before the spell that caused it to trigger does.
• 4/17/2020 You draw a card and discard a card all while Pollywog Symbiote’s ability is resolving. Nothing can happen between the two, and no player may choose to take actions.