Previous Versions can be found here.

Whimsun is a cheap card with the ability to gain +1 ATK for every ally monster on the field, giving it a maximum attack of 5. The changing number of cards on the field does not effect the stats of this card, as the abilities of a Magic activate once; which is when they're placed. One shouldn't typically keep this for late game however, since it has low hp compared to more expensive cards.