Its final chapter gives a Moogle lord payoff by tacking on two +1/+1 counters to all Moogles you control before it exits the battlefield
When the Ursine comes into play, you get to hideaway 3 twice, looking at the top three cards of your deck, tucking one exiled away, and then doing it again
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Then destroy all creatures
With two connected abilities, Xavier Sal can tap to either remove a counter from a permanent you control to populate, or to sacrifice another creature to proliferate
You can either use this to buff up your weaker monsters, turning them into super-strong goliaths using your dead boss monsters or you can weaken your opponents strongest monsters by matching it to your graveyards weakest ATK card