It can't enter the battlefield attached to a nongreen creature, it can't be moved onto a nongreen creature, and if the creature it's attached to stops being green, the Aura is put into its owner's graveyard
Call of the Ring I really like Call of the Ring for a lot of decks too
It allows you to get a feel for different cards and grades without a huge financial commitment
The card called Scrooge McDuck, Uncle Moneybags solves the problem of not having enough ink on hand with its Treasure Finder ability
Contract from Below uses ante, the second worst mechanic ever (lets be real, stickers are #1), and combines it with a 1-mana draw-8, which is hilariously unfair
Comboing like this is not my forte, so I will be referencing a fantastic article written by Kristen Gregory from Hipsters of the Coast for the synergies I talk about here