Phyrexian Broodstar 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
Affinity for Phyrexians (This spell costsless to cast for each Phyrexian you control.) Flying Phyrexian Broodstar's power and toughness are each equal to the number of Phyrexians you control.
Complete guide
Phyrexian Broodstar is a massive flying threat that rewards you for leaning into the biomechanical power of New Phyrexia. By amassing an army of Phyrexians, you can deploy this Beast for a fraction of its mana cost and watch its strength scale with your board state. It serves as both a cost-effective finisher and a scaling protector of the skies.
Harnessing Affinity for Phyrexians
The core mechanic of Phyrexian Broodstar is Affinity for Phyrexians, which reduces the generic mana cost of the spell by {1} for every Phyrexian you control at the time you cast it. While it has a high base cost of eight mana, having six Phyrexians on the battlefield reduces the cost to just two Blue mana. This calculation occurs only once as you cast the spell; once the cost is locked in and paid, changing your creature count won't affect that specific casting.
Scaling Power and Toughness
Unlike its casting cost, Phyrexian Broodstar's power and toughness are defined by a characteristic-defining ability that functions in all zones, including your hand and the graveyard. Its stats are constantly equal to the number of Phyrexians you control. This includes the Broodstar itself once it is on the battlefield, meaning it will always be at least a 1/1 as long as it remains in play.
When to Deploy the Broodstar
The ideal time to play Phyrexian Broodstar is after you have established a solid board of cheaper Phyrexians. Because its power fluctuates, it is most vulnerable to removal if your other creatures are destroyed. However, its Flying ability makes it an excellent choice for bypassing grounded blockers to end games quickly once your 'Affinity' count is high enough to cast it efficiently.
Interaction examples
If you control four Phyrexians and three artifacts, Thought Monitor costs only {U} to cast due to its Affinity for artifacts. After Thought Monitor enters the battlefield, you now control five Phyrexians (since Thought Monitor is an artifact creature, but not a Phyrexian). If you then cast another Phyrexian creature, bringing your count to six, Phyrexian Broodstar will cost only {U}{U} to cast.
If you have Hullbreaker Horror on the battlefield and cast Phyrexian Broodstar, the Horror's triggered ability goes on the stack. You can choose to return a nonland permanent or a spell to its owner's hand. Even if Hullbreaker Horror is not a Phyrexian and does not reduce the Broodstar's cost or boost its stats, casting the Broodstar provides the necessary spell trigger to clear the way for your flying Beast.
With only Phyrexian Broodstar on your battlefield, it is a 1/1 creature. If you cast three more Phyrexian creatures during your turn, the Broodstar immediately becomes a 4/4. If one of those creatures is destroyed later by an opponent, the Broodstar's power and toughness instantly drop to 3/3.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Phyrexian Broodstar
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Phyrexian Broodstar
No archived Top 8 deck with this card yet.



Thought Monitor
Hullbreaker Horror