Is it possible to create a special team combo skills features?
For example,
-3 same exact monsters, will trigger a special team skill, or
-3 same element type, or
-3 monsters from the same book, like dragon book, spirit book, or
-Special set monsters like hippierion + prototyperion + sweeperion will trigger a special team skill, or maybe summon ingenica to cast her special skill, or
-General uria + uria’s pet + uria’s bodyguard to trigger a team combo
Something like that,
but just make sure common monsters or the-more-not-so-powerful monsters like the common monsters, UC, rare or epic monsters will have a chance to shine again besides all those all mighty monsters like the nemesis monsters which are really too powerful.

@stevec0505 I could see this for team war monsters, essentially all of the generals along with their pets and bodyguards. Another group that seems logical to also have it would be the Family Book.