Far easier to cast than the clunky Marshals Anthem, often cheaper than Triumphant Reckoning and Brilliant Restoration, and most importantly it brings back creatures
At least give it Reach
If one of those creatures can't attack its owner that turn due to a spell or ability (such as Chronomantic Escape), you may have it attack another player, attack a planeswalker an opponent controls, attack a battle an opponent protects, or not attack at all
It plays well with any card in Magic not called "land." It's such a force that it had a good presence in Standard way back when
They don't copy whether that creature was tapped or untapped, whether it had any counters on it or Auras and Equipment attached to it, and so on
If your attackers have the mobilize ability, the buffs work wonderfully with the new tokens provided