With one kick you're on par with other 2/2 Swampwalkers for three total mana, but at two or more kicks you're losing value when you end up with a 3/3 for five mana, or a 4/4 for six, etc
You won't even get to that mana often and now you just ramp more
Alternatively, you can run him more like a Control deck, holding up mana to remove threats by throwing Equipment at them
The cards would play similar roles, and Enduring Curiosity not only has built-in protection but also requires significantly less work to use
Whatever changes Wizards could make I do appreciate as its very likely contracts with Ubisoft were already signed and deadlines already set
Based on the latest market prices tracked on TCG Stacked, Goblin Guide is worth about $0.99 USD for a regular copy and $1.34 USD for a foil copy