The exception is if you manage to pick up a Pyromancers Swath, at which point Grapeshoting your opponent to death becomes much more reasonable
While it might be tempting to just spend these on individual cards that tickle your fancy, Id suggest holding on to them
With this said, Professional Sports Authenticator estimates the average value of a Near Mint Alpha Timetwister to be $5,000, a Mint to be $9,500, and a Gem Mint, $20,000
They hold cards more securely than top-loading pages, especially if the binder is moved around
To retain the current pace of the format, Wizards may elect to pre-ban Fetch Lands
Since it has an ability that replaces its normal entering, Metamorphs controller may choose a creature or artifact on the battlefield for Metamorph to become a copy of