蝌蚪共生体

Text:

如果你施放的生物咒语具有合变异能，则它减少来施放。
每当你施放生物咒语时，若它具有合变异能，则抓一张牌，然后弃一张牌。

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.