Being too aggressive with your flicker effects can leave you unable to defend your creatures or combos from removal spells, but being overcautious can also give your opponents time to draw the card they need to take control of the game
I also like Arena of Glory, because it can give haste to two creatures
Custom proxies solve a different, more personal one
Just needs too much setup to be viable, notes u/DeathByChainsaw in the reveal thread
#5 I also play Omnath, Locus of Mana , which is both a storm-like The Great Aurora -deck, and a deck with plenty of trample tricks to indeed turn people into so much paste
Current MEGA era boxes (8,500-14,500) are early in their appreciation curve, with 6 of 8 sets not yet out of print