26 Apr 2014
Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
26 Apr 2014
Heroic abilities won't trigger when a copy of a spell is created on the stack or when a spell's targets are changed to include a creature with a heroic ability.
26 Apr 2014
Heroic abilities will resolve before the spell that caused them to trigger.
7 Dec 2018
If a card in a player's graveyard has {X} in its mana cost, X is considered to be 0.