Same deal as the foil-etched slot applies, twice the rares means that any rare is 2/280 or 1/140, and any mythic is 1/280
Lands like Darksteel Citadel, Cascading Cataracts or Flagstones of Trokair (if your deck also has white) give you ways to shrug off what is intended to be a symmetrical effect with ease
Serra Redeemer (Foil EA $4) Most of the 1/1 boosters are touching green, but if you want to make a lot of tokens become a lot bigger, this is a great place to start
This is especially helpful for rare cards that may be difficult to price accurately
Thrasios, Triton Hero [Partner]: It's not about getting more lands if you are paying 4 mana to scry 1
End the FestivitiesEnd the Festivities (46,795 Inclusions, 2% of 2,337,008 Decks) This won't be the last "pay one mana to draw three cards" spell we see on this list, but it might actually be the best of them with Niv-Mizzet