This not only buffs the damage capabilities and survivability of your merfolk, but it also allows them to more easily deal damage without being intercepted by blockers
Is this list permanent, and how does it affect the ban list
It is a field spell, however, and although that means it is searchable ( A huge plus) it also means that we can't run stall as effectivly, as you unwittingly removed the ability to play "The Sanctuary in the Sky"
Eshki, Temur's Roar is a satisfying commander without typal restrictions, letting you run it in all manner of battlecruiser decks
In one-on-one formats its a bit of a harder sell, but if youre about to lose to poison, taking a bit hit to your life to regain your position in the game would generally still be the right move
If one of the player's cards is low on HP but still has Energy when swapped for a benched Pokemon, this card can be activated to make sure that players can get an attack away as soon as possible with the new card in play