Storm-Kiln Artist turns your spells into mana by producing Treasure Tokens, while the classic Young Pyromancer creates a 1/1 creature for each spell you cast
For some extra copying, you can copy Esper Terra to copy even more summons , and essentially keep token copies of Esper Terra around while still constantly transforming the original
The biggest downside to this creature is that it doesnt have islandwalk or trample, which would make it significantly more powerful
If you make your cards on a computer, you can sell them on thegamecrafter.com
Without new data from Wizards officially, its unclear exactly how Historic and Timeless are faring against one another
As such, I've slid further into flipping raw singles (cards) until turnaround times have improved at the major grading services