When you are reliably discarding this and having it as a two mana option from early in the game it is pretty good
Imagine combining [mtg_card]Skullclamp[/mtg_card] with [mtg_card]Bitterblossom[/mtg_card], or any other card that can create a lot of 1/1 creatures
Beyond Magic: These are the best trading card games out there Cards that interact with treasure seem to be increasingly common in Magic, for Commander as well as for Standard, so the sun may not set on Goldspan Dragon for a good long while
I love this at multiplayer when you have a few options, and with Mana Rocks and Lands that can make any color of mana, because getting any color of mana from your Dimir control brew that grabs a red activated ability is pretty valuable, so run this with City of Brass and Darksteel Ingot and Fellwar Stone
Entropic Uprising Next up, we have the general I have most personal experience with: Yidris, Maelstrom Wielder