Something you can't ignore is that this is a triggered ability, meaning it uses the stack. What that means is that, if you have two out at a time, both activate and are put on the stack. Now, normally this is just an additional untapping, but if you have mana weenies and something that uses mana, like Ezuri, you get more activations of Ezuri. For example, I've managed to use this card to facilitate a combo that would let me swing for over 250 damage on turn 4. It's next to impossible to get off, but it would be completely glorious if it did happen.
The combo requires the following cards, and it was standard at a point:
2x Llanowar Elves
1x Elvish Archdruid
1x Ezuri Renegade Leader
4x Copperhorn Scout
1x Craterhoof Behemoth
2x Forest
On turn one, and you have to be on the draw for this combo, you play a Forest, and a Llanowar Elves. Next turn, you untap to play a... (see all)