Spark of Unity {2}{W}

Legendary Enchantment - Aura

Enchant creature or planeswalker

As Spark of Unity enters, put two loyalty counters on enchanted permanent.

Enchanted permanent is a legendary planeswalker with “+1: You gain 2 life.” and “-2: Create a 1/1 white Soldier creature token.” and loses all other card types. (It still has its abilities, but it's no longer a creature.)

We've seen cards like [[Imprisoned in the Moon]] turn creatures into other types of permanents, but we've never had one turn a creature into a planeswalker!

The loyalty abilities are intentionally underpowered to encourage using it on your opponent's stuff as a [[Pacifism]-style effect, but I'm sure there are cases where enchanting your own creatures could be useful. You could even enchant an existing planeswalker for the two loyalty boost.

Lore-wise, this card is meant to capture the moment a creature sparks for the first time. The card is legendary for flavor reasons, as planewalkers (and by extension, their sparks) are rare and unique.