Turn 3, you can then use G-Max Centiferno to Knock Out, having used Welder for 2 Energy and attached another
But the reserved list turns this into an absolute nightmare
Its power is definitely interesting, as being able to refill a hand after playing trainer cards keeps options open
And, since there are a bunch of different directions you can take a multicolor deck that may not always overlap in terms of card choices, it makes a lot of sense that the most played five-color card is an all-in-one mana fixer
But The Birth of Meletis is kina sorta like putting a Plains that can block on top of your library over and over
Certain cards lend themselves to creating an engine that you can build around them- Plentiful Dead, Noble Unicorn, and Angel of Mercy