For example, when a Set "Dark Contract with the Witch" is activated, its effect to destroy a card can be activated in the same Chain Link
T: Add 2 to your mana pool. That's a land that would cause no end of trouble, and it would go in almost every deck with a respectable land count that could afford to run colorless land
Im on the fringes of it (I dont collect/play anything but exactly Oops, but several of my friends are into it), but cards like Wandering Emperor exist, as does the entire Kamigawa set
The resulting permanent is a single object represented by two cards." (Comp
negate the effects of face-up monsters your opponent currently controls with ATK less than or equal to it until the end of this turn
Conversely, Starter Deck products like Planeswalker Decks or Intro Decks only have one preconstructed deck