Politically, its difficult to know whether or not having a lot of Energy is good, let alone what number is dangerous, since other players arent sure how to value Energy as a resource
If you cast it without a Time Vault, you could go find it and threaten to take infinite turns, next turn
It isnt terrible after all its removal, and it can put itself in the graveyard which the Black-White deck especially is interested in
P/T Set Number 88 Language Portugus Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (5/12/2023) Narset's first ability gives it prowess while it's on the battlefield
While calculating his combat damage, I forgot to factor in his double-strike ability until someone else pointed it out