I just got back into competitive Magic (Legacy to be specific) and I have a new favourite card. As a Mardu burn player, I can either run the standard discard cards like Hymn to Tourach, Cabal Therapy, or Thoughtseize, but everyone is running those cards, so I thought I'd be different and run Hymn to Flame Rift instead. It gives a choice (something which a lot of players don't like giving), but both choices kind of suck to be on the receiving end of. If this card allowed the caster the modal choice, it might be a little too powerful, but where it is, I love it.
Pros: Hymn to Flame Rift
Cons: Allows target to choose