Marwyn, the Nurturer is the of the ramp-oriented elf commanders
Aetherflux Reservoir - easy storm finisher with Kykar's engine
But I would cut down Abundant Growth since it doesn't ramp you (put in Birds of Paradise instead, they will ramp into your commander) and put in one or two more Umbras to give your commander totem armor ( Octopus Umbra to boost your commanders P/T by 8(!) and Drake Umbra for some evasion)
In blue, Enduring Curiosity offers a similar effect with flash, and it even sticks around as an enchantment when it dies
Usage Potential: Medium, draw to win decks and combo love this one Decks: Draw to win (Niv-Mizzet, Prime Speaker Zegana, etc) almost any combo deck with U Grade: B An absolute Commander staple, Blightsteel is one of the classic Tinker-targets and while Tinker is banned in Commander, we still find ways to seek this beast out and end games pronto