mtg 60 card deck breakdown Pro Tour March of the Machine Standard Metagame How To Build A Magic:

Originally all werewolves had the text At the beginning of each upkeep, if no spells were cast last turn, transform this card on the front side and At the beginning of each upkeep, if a player cast two or more spells last turn, transform this card on the back

It does have an upside, but that is best in spell slinging decks, so you won't get much milage of this

None of that is to say that Elsha isn't fun or interesting

Definitely interesting for Modern Dredgevine as an additional pay off creature

You can also probably get away with just running one copy in the deck if you have a card you use to add a little utility or support to your strategy, or one that you use as your silver bullet against certain strategies that are more common in the metagame