2005-08-01 If you choose Wall, then your creatures can still attack because creature types don't confer abilities such as defender (any more than, say, choosing creature type Bird would confer flying)
it could be with combat damage thanks to our big beaters like Artisan of Kozilek, or it could be casting doubled Treacherous Terrains with Swarm Intelligence out, then getting it back with Volcanic Vision to cast it again
Battles which, at least in their initial incarnation in March of the Machine, are all specified as the Siege type are an entirely new type of card, let alone double faced card
Cards that seem a bit random on launch will often receive additional support later, effectively serving as teasers for full archetypes in retrospect
There are three sets of Meld card pairs in The Brothers' War: Urza, Mishra, and Titania Powerstone tokens, as first seen on the Dominaria United planeswalker card Karn, Living Legacy , are also a major mechanic in The Brothers' War