Daughters of Baba Yaga
Your innate magic comes from your ancestry which can be traced back to a powerful witch or mystic. Only the women in your family have this sorcerous blood, but few study and foster the powers it can harness. Any witch that shares a lineage to Baba Yaga can recognize one another on sight regardless of how distant their familial connection might be.
At 1st level, choose one spell from any class with the Ritual tag. The spell must be of level you can cast, as shown on the Sorcerer table. The chosen spell counts as a Sorcerer spell for you, but isn't included in the Spells Known column of the Sorcerer Table. You can also cast the spell as a Ritual. When you gain a level in the Sorcerer class, you can replace the chosen spell with another spell, following the same requirements
Starting at 1st level, you always have a familiar at your command, as per the find familiar spell. If it is killed or destroyed, then after you've completed a long rest you can summon it again from its pocket dimension as a bonus action.
Starting at 6th level, as long as you have at least 1 sorcery point to spend you can detect invisible or concealed creatures of the beast or humanoid type within 30 feet of yourself even if they are behind cover. You cannot sense the presence of undead or constructs, nor can you pinpoint exactly where a living creature you can sense is, but you are aware of when living creatures come near.
Additionally, you can now cast Bestow Curse as if it were part of your available spell list.
At 14th level, you gain access to the Shapechange spell and can cast it as if it were a 7th-level spell, but when you cast it at a lower level you may not apply Metamagic to the spell. Additionally, you can now cast either Animate Objects or Polymorph as a Quickened spell without spending Sorcery Points, but only if you have the Quicken ability and no other Metamagic may be applied to the casting.
At 18th level, you stop aging. You are unaffected by any kind of magic that prematurely ages you, and you will never die of old age. After you spend one or more Sorcery Points roll 1d20 and on a roll of 19 or 20 you instantly recover one Sorcery Point.