An X in a cards mana cost is counted as 0 towards its mana value, except when that card is being cast
Authentic Japanese Pokmon TCG product
You can wrap up the game with big white creatures like Elesh Norn, Grand Cenobite and Sun Titan or take a spicier route with infinite combos like Heliod, Sun-Crowned and Walking Ballista
Besides Cubes and the official Standard and Expanded formats, custom formats were fairly scarce due to the obvious crucial limitation of playing in-person: every player needs physical cards
I wouldnt expect much more than new art for the face commanders
For example, in the deckbuilding area Bubble Smuggler has the card styles expanded to show my two visual options, I can heart the one I prefer, then collapse the arrows and the setting is retained when I use that card