Although Clarabelle played a major role in early Mickey Mouse shorts and other classic material, she's been largely forgotten in the modern age
The next time one or more creatures or planeswalkers enter the battlefield this turn, they enter as copies of the chosen creature instead. Basically, you can choose to have an opponents planeswalker or world-ending creature come in as a 1/1 Thopter instead
You might think that the best colorless way to give double strike Fireshrieker would cost a lot, but it's just 0.49 too
As long as you get in at least one hit, youve already gotten your card back, with the potential there for so much more
It gives you a nigh-impenetrable shield for a turn, giving you protection from everything until your next turn
Most hand disruption only costs one or at most two mana, so you can play them as early as turn one