You always get a rare or mythic rare that is a card with the showcase fang treatment, a showcase eternal night legend, a borderless dual land, a borderless planeswalker card, or a Dracula series card
A fourth, smaller but common, is forgetting to attack with the leader herself: Yamato has Rush as a leader, so that attack is free every turn, and skipping it is a missed point of pressure, not a safe pass
Magic Arcana - November 23, 2011 - Wayback Machine Inside
Thousand-Year Storm While this card is hilarious, it was very tough to make it work since you basically had to take turn 6 off to use it, and your deck also had to have enough cheap spells to get it going
(2/29/2020) Duh can target a creature token only if the object you're using to represent the token has reminder text, even if it's a copy of a creature with reminder text.