Colorless self-mill is hard to come by, but not unheard of
[Once Per Turn] If this Character would be removed from the field by your opponent's effect, you may give this Character 2000 power during this turn instead
Not terribly strong as you bat commander but excellent in your 99, you really only need to empty one opponent's hand (find the aggressive player) and you'll be ready to return the Temple of the Dead flip land to the card drawing, token generating, life draining bat, and rule the table
One of the best examples of a white indestructible creature is Avacyn, Angel of Hope
Impulse draw is considered a form of red card draw, quotations there being quite intentional, but there's so much red impulse draw that we've left that off this particular ranking