if you cast
Swift reconfiguration on a
devoted druid you create a vehicle artifact which is not a creature! this way you can tap the druid for mana and untap it with a -1/-1 counter without it dying from the counters! therefor you can generate infinite green mana and do basically everything in this deck.
nylea and duskwatchr ecruiter get you every creature from your deck with infinite mana, including
walking ballista. and you can use shigeki to return anything from your graveyard that is need to kill (if, for example, the ballista is in your grave by the time)