Act of Aggression

Mana cost: {3}{R/P}{R/P}
Type: Instant
Set: Commander 2015 #141 (uncommon)
Price: $0.33 USD

({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.

Act of Aggression has 2 printings, first in New Phyrexia (2011). EDHREC ranks it #9,318 among Commander cards. It appears most in Brion Stoutarm decks (1,555 on EDHREC). 1 public deck on TCG runs it. It has 7 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Act of Aggression

Seize Control - Commander 2015, led by Mizzix of the Izmagnus

Commanders that run Act of Aggression most

Deck counts from EDHREC.

Often played with Act of Aggression

Cards that show up in the same decks on EDHREC.

Rulings

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: 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: If you're at 1 life or less, you can't pay 2 life.
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.
2011-06-01: Phyrexian mana is not a new color. Players can't produce Phyrexian mana.
2011-06-01: Act of Aggression can target any creature an opponent controls, even one that's untapped.
2011-06-01: Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.