I also like Arena of Glory, because it can give haste to two creatures
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
#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
Custom proxies solve a different, more personal one
The face commander, Eowyn, Shieldmaiden, creates two 2/2 human creature tokens (at the beginning of combat on your turn) if another human has entered the battlefield
Jumpstart: Historic Horizons is a Magic Arena only set