Cards like Snapcaster Mage, Mission Briefing, and Torrential Gearhulk all let you cast spells from your graveyard and can turn all your spells into two-for-one by doubling them up
While not truly comparable to Frilled MysticFrilled Mystic, since the familiar can only counter creatures, if you're holding up four mana and nothing comes around that's worth countering, you can still choose to surveil 3 or remove a pesky enchantment
However, as it's been said a lot, it's a tribute summon, and it's a fish, so isn't Superancient Deepsea King Coelacanth good enough
of choice, then you SS this again and proceed to bounce it for a second), so that may be an issue
Still, all indications show that this card will go down in price, unless some hidden powerful interaction will be discovered in one of the relevant formats
Its ability to accelerate Lightning Energy before evolving into Raichu made it a useful option in several decks of the time