When Plagon, Lord of the Beach enters, draw a card for each creature you control with toughness greater than its power. : Target creature you control assigns combat damage equal to its toughness rather than its power this turn.
Plagon's last ability doesn't actually change the target creature's power. It changes only the amount of combat damage the creature assigns. All other rules and effects that check power or toughness use the real values, even if they cause damage "equal to a creature's power" to be dealt.
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.