Pollywog Symbiote — ruling 1

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.

Pollywog Symbiote — ruling 2

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.

Pollywog Symbiote — ruling 3

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.

Pollywog Symbiote — ruling 4

Players can cast spells and activate abilities after the triggered ability resolves but before the spell that caused it to trigger does.

Pollywog Symbiote — ruling 5

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.

Pollywog Symbiote : règles, fonctionnement et interactions (MTG)

Pollywog Symbiote is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Each creature spell you cast costs less to cast if it has mutate. Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.

How it works : Pollywog Symbiote

Original English text — Wizards of the Coast / Scryfall

#1April 17, 2020· Wizards of the Coast
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.
No other card is named in this ruling.
#2April 17, 2020· Wizards of the Coast
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.
No other card is named in this ruling.
#3April 17, 2020· Wizards of the Coast
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.
No other card is named in this ruling.
#4April 17, 2020· Wizards of the Coast
Players can cast spells and activate abilities after the triggered ability resolves but before the spell that caused it to trigger does.
No other card is named in this ruling.
#5April 17, 2020· Wizards of the Coast
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.
No other card is named in this ruling.