Some of my top picks include the Latias ex SIR, Latios SIR, Skarmory SIR, and Mesprit SIR
An instant speed punch is so much better
When you cast a card with Retrace from your Graveyard, you're casting it from the Graveyard, not your Hand (so Phage, the Untouchable would kill you immediately, for example)
While in theory it can be good against control decks, in most matchups it is too slow (although it can be sweet with Engulf the Shore if the game goes super long, since we can bounce it back to our hand without actually getting in combat damage)
If you run out of ink from your printer, you can always go to a specialty store to get them printed
Whenever Rulik Mons attacks, look at the top card of your library