This list leans heavily on Faldorns ability to produce an army to finish things off
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Serah Farron or Crystallized Serah's first abilities)
The most famous issue of all, however, has got to be the infamous Blue Hurricane
At maximum speed your land gets a new ability, letting you pay three mana and tapping it to discard a card, and then draw a card
Green Sun's Zenith has two different instructions that tell your opponent to shuffle his library, so the Trickster's ability triggers twice, even if in reality your opponent probably shortcuts the two shuffle actions into just one shuffle
Let's break it down