Seems solid enough in limited, but of lesser utility in standard where you'd most likely be casting this on turn 4/5 anyway with the treasures you make and at that point just play a 6/7 drop rather than a vanilla 5/4
Good thing Treasures make mana of any color, because I remembers Standard's Treasures deck is Rakdos. Between this and Ziatora, the Incinerator, I wonder if there are enough cards like this to shift the deck's base colors.
Outside of limited (and there better be a good amount of treasure-making options in limited to make this useful enough), not too sure how I feel about this. No other gimmick (read: keyword) to make it playable (like haste, trample/first strike (or at least those last 2 when attacking). I want to like it, but it feels like most of the time it would get cut when deck building/designing.
Even if you do have to cast this on turn 3-5 with treasures, that still allows you to double spell, which is a really big deal. Imagine if this set has an equivalent to Unexpected Windfall in this set, that would be a spicy turn 4 in limited.
I like it. The base 5/4 for 2RG is still fine for limited.