First, it will deal it before all other creatures, as if it had first strike
X Tin Promo - While I dont have any memories opening ex era packs, I do vividly remember buying and opening DPP tins
The tokens are getting sacrificed anyway at the end of your turn, so getting some extra value beforehand is nice
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The reality is, many Book cards share this ability
Having a black mode that forced the opponent to sacrifice a creature or planeswalker was too weak, for instance, so they changed it to "highest mana value" to make the mode better and serve as the efficient creature removal mode for the card
