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The Underdog can also come back by itself later

Loxi: I don't particularly care for the counter effect, only because it will really just delay the card for one turn

Ox of Agonas The Ox of Agonas is even more powerful, and will absolutely have implications for eternal formats as an enabler for Dredge, Hollow One, and other such discard-focused decks

has shared a breakdown of what you can expect, which you can find here.

Board-breaking cards like Raigeki and Harpie's Feather Duster are poor choices to put in a deck going first, so they will usually remain in the side deck until the player is going second

However, Zane defeats him and Nightshroud's lingering powers are dispersed again