Act of Aggression
({R/P} can be paid with either {R} or 2 life.) Gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn.
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Official rulings (7) · Scryfall
As you cast a spell or activate an activated ability with one or more Phyrexian mana symbols in its cost, you choose how to pay for each Phyrexian mana symbol at the same time you would choose modes or choose a value for X.
A card with Phyrexian mana symbols in its mana cost is each color that appears in that mana cost, regardless of how that cost may have been paid.
If you're at 1 life or less, you can't pay 2 life.
To calculate the mana value of a card with Phyrexian mana symbols in its cost, count each Phyrexian mana symbol as 1.
Phyrexian mana is not a new color. Players can't produce Phyrexian mana.
Act of Aggression can target any creature an opponent controls, even one that's untapped.
Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.