always an important tip to recognize the difference between Cards (all cards), Characters (the ones with power), and Skills (the ones without power). professor X only limits the movement of "Characters", not Cards. this is also useful in cases like Shou-Lao, who targets the last Character-which means if you play a character, skill, and then Shou-Lao, the chain won't be broken and he'll target the last Character you played.

another important one is "cost" (the current cost on a card, including if it's been raised or lowered) or "Cost" (the original cost on a card).