Greater Dragonmark

Your Dragonmark increases in size and power. Increase one ability score of your choice by 1, to a maximum of 20. You can cast every spell from your Spells of the Mark list without expending a spell slot. Once you cast any of these spells in this way, you can’t cast that spell in this way again until you finish a long rest. Your spellcasting ability for this spell is the same as the spellcasting ability for the spells you can cast once per long rest as a racial feature, and you don't require material components for them.