This opens up a lot of power very easily as long as you build the deck well, and should lead to an interesting balance of Artifact spells and fodder to make more Golems
Marketback Walker is a nice early to mid game play in a counters deck, provided you have a way to sacrifice it later to cash in for a hand refill
Reckless Racer Reckless Racer rummages when it taps, whether thats to attack, convoke, crew, saddle, etc
It was a real heavy hitter in Standard for exactly this reason: no matter when you drew it, it was almost always relevant
Nothing there is quite as simple as it seems and even the Vampries are a little more than what they appear
This little Pikachu Squishmallow can be clipped onto either, and might I say that it'd look mighty fine attached to a stocking on the morning of a certain holiday