Rules themselves can't be copyrighted, in the sense that the "rule" for flanking is "when two units are involved in combat, and the first has flanking, and the second does not have flanking, the second unit experiences a particular disadvantage" But calling it "flanking" is copyrightable, and for Forge to call it "flanking" is to infringe
To win you need said creature to have 20+ power, and that can be a lot harder to manage
Whenever a nontoken Equipment you control enters, create a token that's a copy of it, except it has "This Equipment's equip abilities cost less to activate." Sacrifice that token at the beginning of the next upkeep
Vexing Shusher fixes all that
In addition to these new commanders, Wizards of the Coast has also introduced a new mechanic called "Partner" in Commander 2016, which allows players the ability to have two commanders if both have the "Partner" mechanic, as seen below with two cards from the "Invent Superiority" deck
Although, if your opponent plans to play a big guy with the help of Sol Ring or Black Lotus, Paralyze will probably save your ass
