(Fortunately, there are hundreds to pick from, so there is plenty of opportunity to add a personal touch)
Themberchaud isnt cheap, so alongside making sure you hit all of your land drops with card draw, youre going to want to run Dracogenesis to cast it for free, Hellkite Courser to haste it out for a turn, and cards like Mana Geyser for a big turn to burn people out
It has a holographic foiling which looks better than other cards due to how little space the Kingdra takes up in the card art
It's arguably the most mana-efficient draw spell ever printed
The most important questions on how "economical" it is to play Magic: the Gathering Arena remains unknown: how much time or money does it take to earn a tier-one Standard deck or to Draft.
To keep things fair and manageable in our own BC power level, cards like these should likely be reconsidered when making further changes to the precon