With Elsa, you can lock down your opponents key pieces, and keep them out of action for a whole extra turn
Your mileage will vary, but with card sleeves alone you should be protected from most of the hazards associated with playing on a kitchen table or a bench at the local game shop
It obviously has a home in blue control decks, but I dont think they will want to play the full four copies of the legendary enchantment, even if it isnt too bad in multiples, as you can have one transform into Azcanta, the Sunken Ruin while the other stays on the enchantment side
Currently, this card doesnt really see any competitive play, but its hugely popular in Commander
Riley & Eric Wilkerson Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp