Gaia the Magical Knight

(This card is also always treated as a "Gaia The Fierce Knight" card.) If you control no monsters, or your opponent controls a monster with 2300 or more ATK, you can Normal Summon this card without Tributing. If this card is Normal or Special Summoned: You can Special Summon 1 Level 5 Dragon monster from your hand or GY in Defense Position. You can only use this effect of "Gaia the Magical Knight" once per turn.