If it's a land card or a creature card with mana value less than or equal to the number of loyalty counters on Nissa, you may put that card onto the battlefield
You could certainly stretch things by including ones like Skeletal Changeling or Avian Changeling, but they are certainly very low power without a significant boost from a lord card
For example, if the chosen exiled card is a land card, you may play it only during your main phase while the stack is empty
Testing Testing and deck-building are really part of the same process
They mustve dragged the images from a 1st ed sheet, wish i had a better understanding of it but that tells me traps were on the black plate if it was only pikachu
However, this spell, which was normally intended to be used in a Grixis-colored deck, was adopted as a special move in a 5-color control deck using a combination of Vivid Land and Reflecting Pool , and thanks to this, the 5-color control deck at the time was called 'Cruel Control'