Then every time you name Chandra, for example, you could double up to 19 different abilities
(Depending on the situation, the Judge may opt to extend time, but this is not guaranteed.) Both Duelists are responsible for playing at an acceptable pace so that the Round ends before the Time Limit
Usually, banishing "Infernity Necromancer" doesn't put you at a disadvantage if you have already used its effect to special summon an "Infernity Archfiend" from your graveyard, because special summoning another "Infernity Archfiend" will allow you to add "Infernity Barrier" to your hand, setting you up for an OTK in the second turn with the +500 ATK boost "Archfiend Palabyrinth" offers
Azlask, the Swelling Scourge Azlask, the Swelling Scourge is a totally different eldrazi commander
Poison the Waters Hee-hee
Astral seeks the rest of the Numbers because they contain his lost memories (including the reason he came here in the first place)