They are harmful to players, local game stores, and Wizards , and if things continue as they are, with counterfeit cards improving by the month, they could represent an existential threat to the game as a whole
One of them is when your mana doesnt come only from lands, but from creatures, mana rocks and other sources too
He could attack, block, had evasion, couldn't be killed, and after the Sixth Edition rules changes could attack, kill and live, and block, kill and live
I really want to thank the Commander Format Panel for their hard work here: they have been putting in a ton of time discussing, debating, and working toward conclusions on all of this
A great example is Hushbringer, and the adjacent Torpor Orb/Hushwing Gryff/Strict Proctor package
There's a lot of potential in this 3/2