Heartwood Storyteller will, of course, trigger off of the noncreature spells you cast as well so keep that in mind in case youre running a more spell-heavy group hug deck
The folks over at the Command Zone have figured out the most optimal number
Invasion of Theros / Ephara, Ever-Sheltering Invasion of Theros / Ephara, Ever-Sheltering is an awkward card, like all the underpowered battles
However, she does only cost 3 mana and will survive creature-based board wipes
Interrupts were considered faster than instant spells and would resolve before anything else unless there was another interrupt being played
In the case of the card we have here, a variant of Emrakul, the World Anew, you can see from the stamp on the card that there are just 250 copies of this card printed