13 cards where the cards have the “arena” watermark

Ashnod's Coupon (Arena League 2004 #14)
Bonesplitter (Arena League 2003 #8)
Castigate (Arena League 2006 #6)
Coiling Oracle (Arena League 2006 #8)
Darksteel Ingot (Arena League 2004 #6)
Elvish Aberration (Arena League 2003 #7)
Genju of the Spires (Arena League 2005 #6)
Glacial Ray (Arena League 2004 #8)
Okina Nightwatch (Arena League 2005 #7)
Serum Visions (Arena League 2004 #7)
Skyknight Legionnaire (Arena League 2005 #8)
Surging Flame (Arena League 2006 #9)
Wee Dragonauts (Arena League 2006 #7)

This search is finished. Now the real work can begin.