Target player draws two cards, then discards a card.
Once more information becomes available I'll make sure to let you know, but until then at least we'll have the upcoming friend challenge system to keep us busy.
The biggest difference between having a regular partner versus a background as your second commander is that one is a creature (the partner), and one is an enchantment (the background)
Allowed sets are Black and White onwards which is the same as current official Expanded format You can find the rules, FAQ and ban list at the Gym Leader Challenge website
English sets sometimes incorporate HCP content into different products for example, VSTAR Universe cards appeared in Crown Zenith, and MEGA Dream ex content was included in Ascended Heroes but the box structure, guaranteed hits, and God Pack mechanic are Japan-only features
Shes a Conjurers Closet for four mana, and if you flicker something that isnt yours, you get to keep it