mtg chorus cards of Ironsong Whenever a creature enters the battlefield under your control Elven Chorus | The Hobbit

It can also serve to slow other players down while you try and win

There are plenty of plays that can get you in a winning situation with just a few specific Dragons like: Goldspan Dragon Ancient Copper Dragon Hellkit Charger With Goldspan Dragon and an Ancient Copper Dragon out, you can generate tons of Treasure tokens and then make bonus mana off of them

GRN was designed with the fact that it was another return to Ravnica in mind

Highspire Bell-Ringer can't reduce its own cost, even if it's the second spell you cast in a turn

He was unceremoniously slaughtered by Garruk when charged to find him by Avacyn way back when, and its cool to see him in card form for the first time

You can also grab a key 'walker such as Sarkhan Unbroken who is both awesome and may require the wrong colors and could not otherwise be cast right now