The combination struggles when it falls behind on board, lacking efficient ways to catch up against established threats
And then when that Army deals combat damage, the Ring tempts you, and when that happens, you can discard your hand to draw four cards
Any abilities it has that interact with loss of life, such as that of Platinum Emperion, apply to that loss of life
To really abuse Electrodominance, we need lots of mana and ways to copy the spell: Rosheen Meanderer and Mizzix of the Izmagnus are great candidates for this, and if you add a bunch of Fork type cards (Reverberate, Reiterate, etc.) that turn Electrodominance into a neat "ramp" spell that leads to explosive plays
There is very little that Brinelin fears, but Sorin Markov, the ancient vampire planeswalker, is one of those things