I assume that also applies to Seraph?
Zanz has already stated that Seraph is common, so it's going to be available to all players immediately after it hits the Bazaar. Therefore, not banned.
[2012-04-09 05:03:07] Sevs: is seraph rare?
[2012-04-09 05:04:17] zanzarino: Not rare, but the new cards are not available yet