These paired WATER themes have always played well together, with the Mermail offering various effects that require sending another WATER monster to the GY while the Atlantean trigger off of being sent to the GY to activate a WATER monster effect
The enchantment costs one, activates for two, and then you sacrifice anything, including tokens, draw a card, and then, you'll also gain that life too, don't sleep on that since many read that as losing life instead
Want to learn how to grade cards
By the time the player has unlocked the ability to purchase these packs, they should already have a fair amount of money saved up to buy the license to sell these and at least a couple of boxes of cards
You're selling to collectors, casual buyers, and people searching for gifts
Simplified deck building