It contains the spells you know and the creatures you can summon to fight for you.Card Name: Force SpikeCost: UColor: BlueCard Type: InstantCard Text: Counter target spell unless its controller pays 1.
Stripping away Hexproof and Indestructible not just from opposing creatures, but all opposing permanents allows you to circumvent many difficult to answer pemanents, including Theros gods like Xengaos, God of Revels, pesky protection cards like like Darksteel Plate, and shielded lands like Lotus Vale
If you are playing commander your deck must be exactly 100 cards, no more, no less, including the commander itself
While this means that section 713 got folded into section 712 (where double-faced cards live), there is no functional difference to this change other than allowing the aforementioned effects to find them
It also has a Retreat Cost of one, making it easy to swap out when necessary