If you can surgically extract artifacts from your graveyard one at a time, perhaps with unearth or a single-target exile effect, you can flood the board with artifact creatures in no time
Rub in the moisture so it will cover the whole card size
Wiping away a smudge is one thing, but some collectors have gone to extremes to ensure the card will receive a 9 or a 10 grade
Innistrad's Last Hope tells of the Planeswalkers that make up the Gatewatch experiencing Innistrad's Darkest Hour, what with the Eldrazi titan Emrakul and her lineage wreaking havoc on the world
I once played a game where I ignored an attack by Pharika, God of Affliction, Wingmate Roc, the bird token, Siege Rhino, and several 1/1 deathtouch snakes for several turns in a row by just (massively) outpacing it with lifegain