Start of with Llanowar elves, turn 2 land, then tap Llanowar elves for one mana which gives 3 mana in total,then play might of old Krosa in your main phase which gets devoted druid up to a 4/7 then pay 2 life and put mutagenic growth on devoted druid making it a 6/8 then using devoted druids ability I can have it tap for mana 6 times giving six mana, will this work or am I missing something?