Every pair of cards in a group shares a creature subtype — but no subtype
is common to the whole group. All type lines within a group are unique.
Vintage-legal, single-faced cards only.
Pattern A — 4 creatures with at least 6 distinct subtypes between them.
Pattern B — 5 creatures over exactly 5 subtypes, arranged
123 / 124 / 345 / 15 / 25 (each digit a subtype, each row one creature).
Pattern C — Pattern A or B groups led by two Commander Legends
partner commanders, at least one white; the rest of the group fits within
the commanders' combined color identity.