The value of X is calculated only once, as Charisma Bobblehead's last ability resolves
Rex is firmly in the latter camp, having more in common with Experiment Kraj than most of his Dog peers
What interests me here is that you can still pay five mana to get most of an Austere Command without being in an Energy deck
If Gatherer is such a mess, what options do we have
One of the heuristics I tend to use when building a deck with blue is to count a Counterspell as somewhere between 0.5 and 1.0 instances of a category like protection
With distribution tied strictly to tournament success and BGS Black Label 10 status (flawless 10s in Centering, Edges, Corners, and Surface), it represents a holy grail for collectors: fewer than 50 copies likely exist globally, and only a fraction achieve this pristine tier