It has the same strength/weakness as Ahoy Mateys as the deck only has one primary play pattern, however, merfolk have substantially more existing support cards than pirates
You get many choices
The Marvel required energy, but energy was in all five colors
There were 15 Auras, meaning a total of 31
The massive card flow that people want for free in Commander and multiplayer lead them to attack each other, but not you, especially since they don't have to spend a card to get the card draw, so for them, this is free card advantage over time for each foe that attacks each other, and you'll draw more than the card it took to cast him in one or two turns
LORE: You can only control 1 "Z-Fighter Tien Shinhan." Once per turn, when this card battles an opponent's monster during Damage Calculation, you can pay LP in increments of 500 (max 1500)