Subtle Spellcaster, Variant (5e Feat)
From D&D Wiki
Subtle Spellcaster, Variant
Prerequisites: The ability to cast at least one spell
You have mastered the art of stealthy magic, and can, through various means, minimize the components of your spells until they are completely unnoticeable.
When you cast a spell, you may use this feature to cast said spell without any verbal components, somatic components, and material components that lack a cost and aren't consumed by the spell. Once you've used this feature an amount of times equal to your proficiency bonus, you can't use it again until you finish a long rest.