Contents: 16 Magic: The Gathering cards plus 1 Token or advertisement card 24 cards of rarity Rare or Mythic Rare 35 Uncommon cards 810 Common cards 2 Traditional foil cards of any rarity 1 Additional random card of any rarity (could be Rare, Mythic, or Foil)
The first thing a design team will do when they want to add something is examine what has already been done
It's even better in an Izzet (blue/red) or Boros (red/white) deck that plans on blinking creatures, as you can blink your largest creatures to repeatedly trigger Terror's second ability
Torture Chamber, Thumbscrews, Wheel of Torture, The Rack, and those sorts of cards might make for an entertaining theme deck, but too few of them would have reliably contributed to what the deck wants to do
Some cards have more specific ward requirements
If a card somehow has multiple alternative costs available, you pick one