It turns any green creature into your best possible green creature, which often ends up being Craterhoof Behemoth
Generally, these stickers will be a bit smaller than a real card and will often have a vibrant holo pattern that covers the entire surface of the card, like the pictured Dark Weezing
However, you can still see how majestic it is, befitting these knights of the San D'Oria kingdom's monarchy
Having extra Reunions in hand is not a bad thing, but theres a chance they wont be used because they will be discarded thanks to Ox of Agonas if you have the option of casting yet another Reunion or Reunion on legs that will trigger Amalgams, getting a guaranteed 5/3 on board will likely be better
Alternatively, if your opponent targets one of your valuable monsters with a destruction effect, you can compulse your own monster to bring it home to safety
This rates the current deck that you have and tells you the pros and cons of the deck that you have built