Part of this is warrantedmost trading happens at events with competitive players, so more people want Geist of Saint Traft than Doubling Seasonbut the result is that many traders have opinions of casual cards that are entirely unwarranted
Avacyn, Angel of Hope, Sigarda, Herons Grace, and Shalai, Voice of Plenty can provide a safety blanket for your board
Its also great fodder for things like Dust Bowl or Infernal Tribute
Ultimate Green Goblin Cut card: Abomination, World Ravager Ultimate Green Goblin can still be cast after discarding them to connive
A 5-mana 4/4 Flyer is pretty nice, though Air elemental isnt quite as impressive as it once was
After that, you can play a 5/5 that taps for 5, and while it cant pay for generic costs, knocking out colored mana costs will still put you far ahead even if you only use 3-4 mana