Queza, Augur of Agonies The wheels in the Commander deck go round and round
Along with emptying our opponent's hand with a bunch of discard spells, we also have one of the best discard payoffs ever printed in Tergrid, God of Fright, which allows us to steal any of the permanents we make our opponent discard (or sacrifice)
I have seen this card used as a top end threat but without a fairly decent amount of ramp and good colour fixing I think it is a lot worse than Baneslayer or Wurmcoil in that sort of role
Infinite mana works so long as you include a mana-sink that draws your deck and maybe a singleton haste-enabler
Theres the additional issue that four seems to be the critical mana juncture, so ramping from three to five isnt the best deal, but this also helps four/five color green decks play all the Planeswalkers alongside Centaur Nurturer
Pack tactics Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, create a 1/1 red Goblin creature token that's tapped and attacking