However, if a card states you can have as many in your deck as you like, you can have multiple of those cards
Arcane Adaptation was first released in the set Ixalan Promos, illustrated by Mark Behm
I can understand where that complain comes from: in the past, Expanded has had some degenerate combos, and its not fun to play when, on your first turn of the game, your opponent has already set up a Vileplume (Ancient Origins) preventing you from playing Item cards, or used some combination of cards to make you discard all your hand
Each player searches their library for a basic land card, puts it onto the battlefield, then shuffles
Most of those run spells and instants to zap you or scry, with Cindervines they can still play their reindeer games, but its gonna hurt