Growing Rites of Itlimoc is a special case that well be revisiting Monday Its generally not as exciting as Merfolk Branchwalker
Your main commander is Hearthhull, the Worldseed, a massive spacecraft that you power up by tapping your creatures
Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the copied creature will also work
Firstly, Vivi is a mana-making machine, able to spawn additional mana based on its Power value
(Note, Im saying Green because Captain Storm is Red and Mavren Fein is White, so green is the logical place for the Sun Empires rare legend to go.) Gishath, Suns Avatar Why yes, that is a feathered T-Rex
Players can respond to the reflexive triggered ability as normal, knowing the amount of damage that will be dealt as that ability resolves