Green decks arent always the most combat-oriented, but its not difficult to imagine a base of Lotus Cobra, Eternal Witness, fetchlands, and Wasteland as a starting point to make Spring-Leaf Avenger work
I personally love playing the Corporations since they are mostly on the defense in the game and setting up traps for netrunners gives me the chance to trip up the other player in satisfying ways
Did you find any 'unbeatable" decks
Factors determining value include the cards' rareness, the character (Mew, Mewtwo, Pikachu and Charizard tend to be more valuable) and the artist, who is indicated on the card.
The rules for altered cards are a little more specific: "Artistic modifications are acceptable in sanctioned tournaments, provided that the modifications do not make the card art unrecognizable, contain substantial strategic advice, or contain offensive images
Jumbo Cards are often included in special promotional sets, starter decks, or as part of limited-edition collections