Dude, that’d be an awesome BoI item.

Plastic Dinosaur (active item, 4 room charge):

• size up 3x

• 2x damage

• deal contact damage

• immune to contact damage (can still be hurt by projectiles)

• can’t fire tears

• killing enemies makes Isaac roar

• 50% chance to consume enemies and gain 1/2 heart (or maybe an item charge) when Isaac’s damage is greater than the enemy’s max health.