[mwcard=DNI04] Renewing Rain[/mwcard] and Raincloud are highly situational and likely to only appear in Druid books. The Adramelech Warlock has a built-in advantage against the Druid, so the rain cards just even things up.
On the other hand, [mwcard=MW1Q07] Elemental Cloak[/mwcard] and [mwcard=MW1Q06] Dragonscale Hauberk[/mwcard] are generally useful, already appear in many books, and are highly effective. In order to be successful, Adramelech Warlock will need to find a way to consistently and efficiently deal with them.