Meanwhile, Jund could just die to Prowess in a turn
// Esper Terra Legendary Enchantment Creature Saga Wizard 6/6 (As this Saga enters and after your draw step, add a lore counter.) I, II, III Create a token that's a copy of target nonlegendary enchantment you control
The reality is that fast mana cards are so good that they are banned or restricted almost everywhere else
To get the most out of Goldspan Dragon, you can consider using Gadrak, the Crown-Scourge, Magda, Brazen Outlaw, and Brass's Bounty.
Herald of Eternal Dawn can be a nice surprise threat, especially against red aggro and creature aggro in general, as these decks regularly lack the means to get rid of a 6/6