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Rulings
The total power of the attacking Phyrexians is checked twice: first, as the ability triggers to determine what can legally be targeted. Their total power is checked again as the ability tries to resolve to determine if the target is still legal. Use the power of each of those creatures at that time, even if the creature is no longer attacking or no longer a Phyrexian. If the creature isn’t on the battlefield, use its power from when it was last on the battlefield. If the target has become illegal, the ability won’t resolve and none of its effects will happen. You won’t return the card.
Rulings
The total power of the attacking Phyrexians is checked twice: first, as the ability triggers to determine what can legally be targeted. Their total power is checked again as the ability tries to resolve to determine if the target is still legal. Use the power of each of those creatures at that time, even if the creature is no longer attacking or no longer a Phyrexian. If the creature isn’t on the battlefield, use its power from when it was last on the battlefield. If the target has become illegal, the ability won’t resolve and none of its effects will happen. You won’t return the card.
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