That opens up all sorts of possibilities, although since its a Stage 2 Pokmon, it still takes a bit of work and quite a lot of space in your deck to get it going
When the first activation resolves, search for Moltensteel Dragon first, then pay 2 life or red mana six times to give it +6/+0 until the end of the turn
Just watch out for Quicksilver Fountain's second ability, which will remove all flood counters from all lands in play if each land in play has become an island.
Why Should I Have Cards in a Sideboard
Elesh Norn, Mother of Machines Besides the great vigilance body, the main thing going for Elesh Norn, Mother of Machines as a commander is that it can double all your ETB effects while denying your opponents, making a lot of your opponents cards vanilla
MTG Proliferate is a keyword that allows you to choose any number of players and/or permanents with counters on them and add one more counter of each kind already there