Act of Aggression

2011-06-01 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.
2011-06-01 Act of Aggression can target any creature an opponent controls, even one that's untapped.
2011-06-01 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.
2011-06-01 Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.
2011-06-01 If you're at 1 life or less, you can't pay 2 life.
2011-06-01 Phyrexian mana is not a new color. Players can't produce Phyrexian mana.
2011-06-01 To calculate the mana value of a card with Phyrexian mana symbols in its cost, count each Phyrexian mana symbol as 1.

Card is in preconstructed decks:

mtg.wtf