All "Neodragon" on your field cannot be destroyed and their souls cannot be dropped by your opponent's card effects.
[Counter][Act] During each player's attack phase, choose a monster from your drop zone and an originally size 2 or greater "Neodragon" monster on your field, and you may pay 1 life. If you do, put the chosen card from the drop zone into the soul of the chosen card on your field. You may only use this ability once per turn.