Man-o-War is excellent against aggro, midrange, and Cloudshift and Zombify shenanigans, but awful against control and likely too slow for Horseshoe Crab+Quicksilver Dagger combo
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You need to proactively use blockers and removal to stop the fast decks in the format from getting out of hand, so that you can take advantage of your superior late-game card advantage, and evasion
But on top of that, when this card leaves the field as a result of battle or by your opponents card effect, you can again mill your deck for 3 cards and this time, for every Lightsworn monster that you mill, you can destroy a card on the field
You can chain "Spear Cretin" and "Trap Dustshoot"
It currently trades for over JPY 30,000 per box