While it's useful in the Gravekeeper's archetype, any deck can run Necrovalley as a floodgate to hamper an opponent's plays and use that advantage to win the duel
Most Used Format Non-Meta Decks Public Decks 619 Tournament Decks 4 Top: TCG Total Copies 1,483 Avg Copies / Deck 2.40 Main Deck 99.2% 1,471 copies in 614 decks Extra Deck 0% 0 copies in 0 decks Side Deck 0.8% 12 copies in 10 decks Similar Cards Cards with related names, effects, or gameplay patterns
Splashing in non-green decks is possible, but the colorless fixers (World Map, Blitzball) are decidedly mediocre
Stone Wall: How his ace functions: Galaxy Tomahawk possesses no ATK, but has 3000 DEF, along with the ability to call in a deadly air strike
Definitely get it graded
It severely weakens their ability to react and then takes them out some other way while they are in a weakened state