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In my opinion it can be assumed pretty much for sure that the blank spot was where the Ivy promo Pikachu was originally printed on the 1st Edition uncommons sheet (it is known to appear in the uncommons slot)

Keeping a creature around and getting a little bit of card advantage is a huge benefit in the long term and since it can be done at instant speed, you can use it anytime you want (so long as Soul Diviner doesnt have summoning sickness)

Typically, white aggro decks tend to run out of cards early since their cards require little mana to cast

Additionally, it could move 2 damage counters off of a damaged Pokmon to take it out of range of a KO in some circumstances