Wither originally started to take shape as curse, an ability on creatures where theyd curse creatures they did combat with by putting -1/-1 counters on them
Color is obvious you can order the colors however you like (I tend to use WUBRG just because thats how Wizards sort them on their lists of cards)
This even means you can also use Kenrith to manipulate your opponents into taking each other out
When you trade, you really only have the option of looking at exactly what they have, and then they need to want something that you have, and then the values of those items needs to be equal (heaven forbid it be even $2 off, otherwise no deal!)
Though spells and abilities that are exiled won't get a chance to resolve, they don't count as being "countered." If Sundial of the Infinite's ability is activated before the end step, any "at the beginning of the end step"-triggered abilities won't get the chance to trigger that turn because the end step is skipped
This along with normal full arts already having rainbow variants really bloated up sets from now having a handful for all the pokemon to 1-2 dozen a set
