Basic Trope: Inflating the monster to an enormous size.
Straight: Darksaur turns Dragonsaur giant-sized with a magic staff.
Darksaur makes an army of Dragonsauri giant-sized.
Darksaur turns Dragonsaur planet-sized with a magic staff.
Darksaur turns a miniature Dragonsaur normal-sized.
Darksaur turns Darksaur bigger, but slightly bigger than most normal-sized.
Justified: Darksaur wants to inspire terror and awe in his enemies and enjoys the spectacle of defeating his enemies with giant monsters.
Who needs monsters? By using the staff, Darksaur turns HIMSELF gigantic.
Darksaur shrinks the protagonists, thus making him and Dragonsaur giants from their perspective, anyway.
Or the monster shrinks instead, becoming more dense and thus stronger.
Or Darksaur turns the protagonists into giants, making them bigger targets for Dragonsaur.
Subverted: The staff does not make the monster bigger. But it makes for a useful distraction or attack to help the monster win anyway.
Double Subverted: Darksaur meant to attack the heroes, but accidentally made the monster gigantic. He takes credit anyway.
Parodied: The monster becomes huge and winded up bumping on the edge of the universe.
Zig Zagged: The monster becomes gigantic! ...but is unable to move because the skeletal structure is unable to support the vastly increased body mass... Allowing Darksaur to use a necromancy spell to reanimate a Zombie Dragonsaur, and make it even bigger!
Averted: The monster remains its normal size.
Enforced: "People love giant monsters. Make sure to put some giant monster scenes in!"
Lampshaded: "Well it could have been worse: Could have been bigge- OH GODDAMNIT!"
Invoked: "With this enlarged Dragonsaur, this pathetic country will be mine to keep!"