Incredibly easy. Would have been more fun if it was toned up a bit. Also, the red shield is way better than the final blast, which is a bit strange. 4/5.
Fix Enforced Silence. It's utterly retarded to be locked down for the entire match because one card is bugged. Also, thanks for putting unblockable monsters in the 1 HP challenge - you're a true saint.
I find it utterly retarded to be OHKO'd by enemy ninja with the 3rd katana ability. That, and the designer needs to learn how to spell check. 3/5 for wasted potential.