Above is a helpful image of the graph that Wizards of the Coast has on its website showing the ideal mana curve
Also, he's very strong at playing defense with his instant speed able Phasing out and if you can protect him, you can win fast in a multiplayer game, and the more in the game the better he is
They can be solved fairly easily, and, unless combined with the other half of their combos (proliferation of counters, Mycosynth Lattice, Wheel of Fortune), dont have a huge impact on the game for more than a couple of turns
(at this point, Player #1 Tributes his monster and targets one of Player #2s cards) Player #1s Gemini Spark resolves: destroy it and draw 1 card
Reckoner Bankbuster and Riveteers Charm keep the cards flowing, with the charm also doubling as removal alongside Unleash the Inferno, Voltage Surge, and Infernal Grasp