This card is good even in creature-less boards
If at least one creature in combat has first strike or double strike, you can activate Yuffie's ninjutsu ability during the first-strike combat damage step
It does so little for 3 mana that I cant find myself ever wanting to play this, even if spirits were the most commonly played creature type in all formats
Since Dovin, Hand Of Control only costs three mana to play, you can get it out early to force the opponent to spend more mana for their spells, which can slow them down considerably
An Older Mechanic Revitalized Poison is a tricky mechanic for you to work with, but can be incredibly difficult for your opponents to do much about once the engine starts going
But since were colorless, we cant get cheap and efficient without some kind of drawback