Because Mario represents the undeniable global face of video game culture, the Mario Pikachu #294/XY-P unit will always go for a significant financial premium over its green-suited counterpart
To put it in another way, it's basically assured to hit the graveyard within three seconds after being cast
Its great to always have your Gilded Goose on Turn 1, but if all your threats are Garruk, Cursed Huntsman and Oko, Thief of Crowns, you basically added four more lands to your deck instead of four actually broken cards
Cloud of Faeries allows you to build some board presence with a flying creature and untap the two lands you just used
I have had Library in my unpowered drafting cube for nearing a year now and it has like a 40% win rate at best as a turn one play
Galvanic Blast honestly isnt great but cleans up Liliana, the Last Hope or Izzet Staticaster