Chill makes their red spells cost {2} more, so Lightning Bolt, Incinerate, Shock, and their red creatures become much harder to cast on curve, which is crucial against an aggressive deck like Sligh. Overload is a modest inclusion: its legal targets are Cursed Scroll and Urza's Bauble (both mana value 1 or less), and it can be cast with Forsaken City or Shivan Reef. Thwart is too slow and mana-intensive against a deck trying to race you. Black Vise only damages them when they hold five or more cards in hand, and Sligh empties its hand quickly, so it does little here. Prioritize landing Stasis as fast as possible, since it keeps their permanents from untapping and slows their clock.