From getting two buffs out of Nagao, Bound by Honour, to crafting a mini board wipe with two triggers of Ronin Cliffrider, the potential of this ability is boundless
I believe that Faithless Looting can be a helpful addition for Mono Red
Its ultimate ability needs a bit of rewording, though
Note that's "cast" and thus happens and cannot be countered traditionally and can be a combat trick to save him from red's burn which is the only thing that can easily answer him or just get him past burn too
(Its a little strange to me that this card is in the green-black deck, rather than the green-blue deck.) The worst-case scenario here is a recurring [mtg_card]Overrun[/mtg_card], but it shouldnt be tough for a green deck to get a 5/5 or bigger into play[mtg_card]Avenger of Zendikar[/mtg_card], say, or any other large creature that brings its own army along
Key Cards Ethereal Armor - Turns every enchantment into damage potential