Sliver overlord was just added to arena I went to play slivers and saw a very small selection of slivers to use them. while playing a different deck someone playing sliver overlord played against me and used slivers I can't purchase with wild cards and before you ask yes I tried to do it in historic and yes I clicked to search for cards I didn't own. Those slivers DONT SHOW UP. An example I know for sure they had was cloud shredder sliver I can't buy it but he searched for it with his commander he also had a sliver that gives them exalted that I couldn't buy. If others have it that means its already coded in so why can't I use wild cards on it!?!?!??