As great as myriad is in multiplayer games, it has no bearing in regular Constructed formats, which limits its chances of being used on future Sliver designs
Loyalty and member drops, "X" amount per household, invitation-based preorders and re-stocks are all solid way's to control Pokmania
While it only reduces a creature's power and toughness by two each, and it's not nearly enough to take down stronger creatures, it can get rid of some pretty annoying creatures, especially those which are "indestructible"
If a card specifically states that it moves Commanders from the battlefield to the Command Zone, anything that's been mutated onto your Commander moves along with it, then falls off - and will probably be stuck there, since there's no way to cast non-commander creatures from the Command Zone
Chart shows the price of Chesnaught #5 at the end of each month going back as long as we have tracked the item.