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.
15-06-2010
wotc
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.
15-06-2010
wotc
You can target a creature you don’t control or that otherwise couldn’t attack that turn.
15-06-2010
wotc
The creature affected by Irresistible Prey doesn’t have to attack that turn.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.