Dragonic Resonance

This Skill can be used if the only monsters in your Deck are Dragon Type. [REQUIREMENT] Can be activated if you have a face-up EARTH Attribute Effect Monster with 1500 or more ATK or 1300 or more DEF on your field. [EFFECT] This turn, up to 2 face-up monsters with 2300 or less ATK on your field gain 500 ATK, and their Level is increased by 4.