Rulings

• 2010-06-15
  You can target a creature you don't control or that otherwise couldn't attack that turn.
• 2010-06-15
  If the targeted creature is an illegal target by the time Irresistible Prey resolves, the spell is countered. You won't draw a card.
• 2010-06-15
  The creature affected by Irresistible Prey doesn't have to attack that turn.
• 2010-06-15
  If there are multiple combat phases in a turn, the affected creature must be blocked only in the first one in which it's able to be blocked.
• 2010-06-15
  If the affected creature attacks, the defending player must assign at least one blocker to it during the declare blockers step, unless that player controls no creatures that could block it.
• 2010-06-15
  The creature affected by Irresistible Prey doesn’t have to attack that turn.
• 2010-06-15
  If the targeted creature is an illegal target by the time Irresistible Prey resolves, the spell doesn’t resolve. You won’t draw a card.
• 2010-06-15
  You can target a creature you don’t control or that otherwise couldn’t attack that turn.