When attacking, ensure you have the right amount of energy cards for the move
Boltbender Ecstatic Electromancer Embermage Goblin Fissure Wizard Goblin Cruciverbalist Goblin Electromancer Goblin Flectomancer Goblin Pyromancer Goblin Researcher Goblin Test Pilot Goblin Wizard Izzet Chemister Krark, the Thumbless Mizzix of the Izmagnus Mizzix, Replica Rider Skoa, Embermage
It can be used in a lot of different ways, including creating almost infinite combos with cards like Paradox Engine, or dominating the board when combined with counterspells
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To briefly summarize their strengths: Bilbo is your choice if you want to focus purely on Lifegain since he increases the potency of all your lifegain cards and then doubles as a finisher for the deck
On the surface, it doesnt seem like a great card