The most common way to take out a creature this large was to use black removal spells, and Sol'kanar was both black and had swampwalk to punish the owner of the spell for looking at him funny
Josu Vess, Lich Knight Theres a reason Josu Vess, Lich Knight used to show up in Commander precons a lot: Its because its good
While there should always be options for this, it basically allows you to break the rule of one card in your Commander deck, and because its an Artifact, it can go in any deck
If you're lucky, or just planned ahead, you may cloak a card that has another ability to turn it face up, such as morph or disguise
The additional booster pack ensures you have a few extra hands on deck to face any peril.
I should add an again there, since we on the Commander Rules Committee got some time with early versions of these cards last year