Most of the time Boseiju just makes untapped green mana the same way a Forest would, but it can also be discarded to destroy an artifact, enchantment, or nonbasic land an opponent controls, and lets them get any land with a basic land type in return
However, it basically doesn't mesh with HERO's tactics, and if it's just a counterattack, it already has a special move called "Absol Change Acid" that can take not only monsters but also his Spell Trap
Should opponents simply take their turn without putting a creature into play, I've gained valuable information about their hand
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It sees a lot of play, and its even used in combos as a flicker target