There are only twenty or so effects to choose from, so mostly it's a matter of narrowing down what works best, both for this color combination and in conjunction with one another
Although other decks have strategies that can counter Amber/Amethyst play, the level of strategy necessary to do so is often higher
You can distribute them as prizing in your own tournament, give one to each of the participants, or just keep them all for yourself
Tiny bits of the card could be ripped or serious fraying
FromTheShire: This is stupid good even if simply played fairly, but there are multiple ways you can do things like cast this on turn 4 with enough mana floating to immediately sacrifice it to emerge one of the Ulamogs
Triskelion wouldve made this list some time ago, but its Ballistas world now