While five mana is a lot for a 3/4, flying and haste all but ensure the pair get at least one attack off, at which point their suite of symmetrical abilities come into play
There are always some chase card(s) from a new set, whether it is an overpowered monstrosity, just a memorable throwback, or a strict upgrade to a prior card
Armorcraft Judge , for example, is an Elf Artificer that will draw a card for each allied creature that has a +1/+1 counter on it, and Immaculate Magistrate can tap to put many +1/+1 counters on another Elf creature
Brave the Elements might be the biggest single draw to any mono-white strategy in Pioneer
Intrepid Hero is great against Thought-Knot Seer and Reality Smasher as a reusable removal spell
Just hold a Gitaxian Probe or Mishras Bauble until turn 3 when you cast Jori En, Ruin Diver and you get a card before your opponent can use a removal spell on it