They also have vigilance so you can attack with any number of them and reset during the main phase with Plunderer giving you new treasures to use if they get blocked and die.
I would argue that twisted fealty is the best card. Because it goes infinite and kills every opponent as long as it’s the 3rd spell cast. But Wisps allows you to dig for twisted fealty then resolves either Stella untapped then cast twisted fealty and do it all over again.
