Heroic

[Subiskier]

Would an enter the battlefield ability trigger another's heroic?
{satyr grovedancer} + {pheres-band thunderhoof}

[DylanW18]

No. That creatures ability is just that, an ability. Which is not a spell, as Heroic says whenever you cast a spell that targets the creature it triggers 

[MuggyWuggy]

Spell ruling

111.1. A spell is a card on the stack. As the first step of being cast (see rule 601, "Casting Spells"), the card becomes a spell and is moved to the top of the stack from the zone it was in, which is usually its owner's hand. (See rule 405, "Stack.") A spell remains on the stack as a spell until it resolves (see rule 608, "Resolving Spells and Abilities"), is countered (see rule 701.5), or otherwise leaves the stack. For more information, see section 6, "Spells, Abilities, and Effects."
111.1a A copy of a spell is also a spell, even if it has no card associated with it. See rule 706.10.
111.1b Some effects allow a player to cast a copy of a card; if the player does, that copy is a spell as well. See rule 706.12.