Sorcerer

Sorcerer: Metamagic

From 5th level, you know two metamagic options. You know three option at 10th level and four option at 17th level.

Whenever you finish a long rest, you can replace any metamagic option you know with another metamagic option.

Metamagic

Echoing Spell

When you cast a spell, you can spend a number of sorcery points equal to the level of the spell.

On your next turn, you can cast this spell again at the same level without expending a spell slot unless you lose concentration (as if you were concentrating on a spell)