Offer something to bargain and its actually quite strong, turning into just about any other card in your library, be that Sheoldred, the Apocalypse or Tendrils of Agony after a huge storm chain
Creature spells you cast this turn can't be countered
The big Frog is also real
To ensure that you have the cards you want, when you want them, having cards with the power to draw from your deck into your hand is always recommended
Anim Pakal, Thousandth Moon Anim Pakal, Thousandth Moon rewards you for building around it with cards like Luminarch Aspirant or Rosie Cotton of South Lane to stack +1/+1 counters on it
He's kind of similar to Wulfgar of Icewind Dale from the Adventures in the Forgotten Realms Commander decks, except Isshin triggers when any creature attacks, not just your own