Rufus, Deceptive Showboat

Whenever a creature deals combat damage less
than the amount listed on their card, gain {e}
When you control no other creatures, transform
this card into Rufus, Cunning Duelist.
{e}{e}: This turn, all defending creatures
must block Rufus, Deceptive Showboat if able.
The greatest, and most dashing, if I say so myself, swordsman in all the land - Rufus Arvensis