If a Union monster you control is targeted for an attack, while you control 2 or more Union monsters, you can change the target to another Union monster you control
As you might suspect, this has something to do with the cards obscene rarity
Secret-rare cards contain one, two, or three shiny gold stars, gilded borders, and full-art designs
Booster packs have also changed from Online to Live, with smaller packs of cards (five cards in Live versus around 10 in Online), but with boosters being more freely available to players and occasionally including an extra rare card
(Damage and effects that say "destroy" don't destroy it
It shares the problem that a lot of win more cards have: it requires you to already have a large battlefield of creatures that benefit from having these abilities