Not only is this a cool card in its artwork and subject matter, but it seems to be potentially a very overpowered card as well
Watermark: Quandrix Illustrated by Torstein Nordstrand Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Aang and Katara also throws artifacts into the mix (nice nod to waterbending), and floods the board with allies
To continue the trend of protecting ourselves, Leyline of Sanctity is here as a way for us to turn off cards like Thoughtseize, Burn Spells, and whatever shenanigans opponents can target us with
The only way for a game to proceed smoothly would be for the player to use the Ancient Mew card to supply a translation guide from Runic for verification of the cards attack and the attacks effects
Ill talk about some of the lesser-known cards from this set, and where they might fit in the 99