Thanks to the great design of this card, this removal spell can deal anywhere from 0, 1, 2, 3, or more damage to a creature based on how much Energy you have accrued up to that point in the game
Vial Smasher deals damage equal to that spell's mana value to that player or a planeswalker that player controls
Cast again as an enchantment, it adds a +1/+1 counter to each controlled creature at the beginning of the player's end step
Slap it on something youre scared of, watch as creatures trade and then do it all again
For three mana in the late game, that's quite the package, and even if she comes down in the early game, are you really upset if you pay three mana to get a body in play and a land to your hand