Pixie Illusionist

To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.

If a spell's kicker cost was paid, the spell is "kicked."

Pixie Illusionist's third ability isn't a triggered ability. If it was kicked, there is no point where an opponent can respond while it is on the battlefield but doesn't yet have counters on it.

The affected land loses its existing land types and any abilities printed on it. It becomes the chosen basic land type and now has the ability to tap to add one mana of the appropriate color. Pixie Illusionist's ability doesn't change the affected land's name or whether it's legendary or basic.

You choose a basic land type as the last ability resolves.