This is in part due to the fact that it includes a three-card infinite combo with the cards Gatta and Luzzu, Walking Ballista, and Hardened Scales
This pairs perfectly with both Madam Mim cards, which can return a character in play back to your hand when played, meaning you get to activate any Giant Cobra once again
A neat little combo should your opponent miss the opportunity to take them out
The three main rules are that each player must have a deck of at least 60 cards, each deck can contain only two Ink types (Amber, Amethyst, Emerald, Ruby, Sapphire, and Steel), and each deck can have no more than four copies of a card in it
Those are all great ways to sift the sands as it were, but there dont seem to be many subjective lists that go over what makes an incredibly cool or interesting card
Can you download images of the cards later to print