What is the ruling on altered art cards in a tournament?
The card must e disinguashable. Other than that, jduges discretion. This thread should be in Magic rulings hough.
Players may use otherwise-legal non-English and/or misprinted cards provided they are not using them to create an advantage by using misleading text or pictures. Official promotional textless spells are allowed in DCI-sanctioned Magic tournaments in which they would otherwise be legal. Artistic modifications are acceptable, provided that the modifications do not make the card unrecognizable or contain substantial strategic advice.
The Head Judge is the final authority on acceptable cards for a tournament.
On a similar note, I once "altered" my {Tezzeret the Seeker} to include a list of tutor targets, thinking I was a smart guy. But that practically breaks rule #1 for alters.