For starters it's huge and has flash, so you can plop it down as your opponent's creatures are attacking and let it swallow one of them up
It reads: "Murktide Regent enters the battlefield with a +1/+1 counter on it for each instant and sorcery card exiled with it
It has an Ability, Empty Shell, which says, When this Pokmon is Knocked Out, your opponent doesnt take any Prize cards. The Pokmon also has some added support in the form of Ninjask, which has an Ability, Casted Shell, which says, Once during your turn, when you play this Pokmon from your hand to evolve 1 of your Pokmon and your Bench isnt full, you may search your deck for Shedinja and place it on your bench as a Basic Pokmon. My initial guess would be that this doesnt see very much competitive play at all, but its definitely a really cool card
You'll have one extra ink to move a third character too if you still have three in play