There are many formats of Magic, each with its own rules and restrictions
Elsa Spirit of Winter utilizes the highly effective Shift mechanic, which allows players to pay a discounted cost to place her directly on top of a smaller, pre-existing Elsa card to activate her abilities much earlier in the game
While splashing removal spells can definitely be correct (either because its convenient or sorely needed), splashing game-winning cards tends to be right more often
Why do I feel like Im forgetting something
For safety and hygiene reasons, personal items such as underwear, swimwear, socks, etc
And in the metagame, if there are a lot of Pokemon weak to fire type Pokemon, this card is a must have in your deck, regardless of the type, you can just keep this card on the bench and utilize its Ability, making all of your Stage 1 Pokemon in play fire type, and therefore doing x2 damage to all of your opponent's Pokemon that are weak to fire type Pokemon