Legendary Creature — Starfish Wizard
When Plagon 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.
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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.