Riddlesmith is silly

4 Riddlesmith
3 Goblin Welder
1 Myr Battlesphere
1 Inkwell Leviathan
2 Dack Fayden
2 Tezzeret the Seeker

2 Spell Snare
3 Mental Misstep
1 Izzet Charm
4 Force of Will
2 Mana Drain
1 Tinker
1 Thirst for Knowledge

3 Sensei's Divining Top
2 Voltaic Key
1 Time Vault
2 Mox Opal
5 Moxen
1 Black Lotus
1 Sol Ring
1 Mana Vault
1 Mana Crypt

4 Seat of the Synod
1 Tolarian Academy
4 Volcanic Island
1 Island
1 Mountain
4 Scalding Tarn
1 Academy Ruins

So what you want to happen is cast a Riddlesmith on turn one, cast another 0-mana artifact and draw-discard something big. Next turn cast a Welder and just weld the shit out of that match. Or cast a planeswalker because you can draw mana really quick with the Riddlesmith.