Svella, Ice Shaper (Showcase)

[3], [Tap]: Create a colorless snow artifact token named Icy Manalith with "[Tap]: Add one mana of any color."

[6][R][G], [Tap]: Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.