What are the intended archetypes
As a sorcery, you may pay the mana cost of a locked door to unlock it.) Number 100 Language English Legal Formats Alchemy, Brawl, Commander, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage
If you're the sort of person who spends more time checking for eggs at the Day Care in Pokmon than you do battling, Monster Crown is worth looking at for its breeding mechanic alone
Finally, the older a card, the higher its value
My proof of concept that kept me watching for ways to abuse it was the combination of Emmara, Soul of the Accord, Song of Freyalise, Shanna, Sisays Legacy and March of the Multitudes, which alone is lethal on Turn five (assuming no missed land drops)
Ephemerate is probably strongest in 4c Elementals, where every creature has a threatening ETB that can value-spiral out of control quickly