While the Virus still lets the turn player destroy their opponents' field and hand Monsters with 1500 ATK or more (no doubt useful in such a fast format), the opponent now gets a two-turn shield from any battle or effect damage for free
This might be my favorite way to win for a life gain deck, as 50 life to knock out a player still brings with it a fair amount of tension that cards like Test of Endurance or Felidar Sovereign just dont
Fighting a Shadow: In his first duel with Yuma, and the second up until Yuma blows up his Number with Utopia Ray V, Vector was actually just a duplicate
If it's a tentacle, it's a guaranteed failure, but you can give up cleanly and try a test that doesn't have major side effects even if it fails, as if you knew in advance that it would fail anyway
Beyond their disruptive capabilities, negate cards also help define the tempo of a duel