Getting to discard and draw every time you cast a noncreature spell is nice fuel, ditching excess lands or cards you dont intend on casting and churning through your deck
Removing a game-ending threat for one mana represents incredible value even when opponents gain 10+ life, since dead players gain no life at all
These cards allow a player to recover cards from the discard pile, draw them, or even look through their decks for specific cards that the Trainer Card allows
There are some cards that force players to untap one at a time, however, like Winter Orb, Hokori, Dust Drinker, and Winter Moon
Of these, the art is either done by Ken Sugimori, Mitsuhiro Arita, Keiji Kinebuchi, or Tomoaki Imakuni