yugioh main deck boss monsters Top 10 Great in Structure deck boss monsters are

Borrowing design technology that already exists with protection from [quality], Dominaria s Knight of Grace and Knight of Malices hexproof from [color] counters hexproofs inherent power

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It is more in the tutor camp of cards than other card quality as it only really does one cards worth of setup and doesn't let you stack your library

Therefore they can't be sent to Graveyard or banished for cost, flipped face-down, or become Xyz Material

For Ruby/Amethyst players, helping sing Second Star To The Right could be something useful for Maui, Hero To All to do when there's nothing for him to challenge