Goat format ruling
A Hero Emerges
Card effect (current official text)When an opponent's monster declares an attack: Your opponent chooses 1 random card from your hand, then if it is a monster that can be Special Summoned, Special Summon it. Otherwise, send it to the Graveyard.
Rulings
- You can Special Summon a high-level monster, like Dark Magician, with A Hero Emerges. But if your opponent selects a Special Summon-only monster like Dark Necrofear, or a Spirit Monster, it is sent to the GY.
- When Guardian Elma is selected for A Hero Emerges, and you have Butterfly Dagger - Elma on your side of the field, you can Special Summon her, but if you don't have it, then she is sent to the GY.
- You can activate A Hero Emerges even if you have only 1 card in your hand.
- This ruling addresses what happens if your opponent chooses the following monster card from your hand by the effect of "A Hero Emerges.Special-Summon-only monster: sent to the GY. (Perfectly Ultimate Great Moth, Exodia Necross, Dark Necrofear, Chaos Emperor Dragon - Envoy of the End, all Ritual Monsters, etc.)
- Spirit Monster: sent to the GY. (Yata-Garasu, Hino-Kagu-Tsuchi, Yamata Dragon, Tsukuyomi, etc.)
- Guardian Monster without appropriate Spell Card on the field: sent to the GY. (Guardian Grarl, Guardian Ceal, Guardian Tryce, etc.)
- The effect of "A Hero Emerges" causes a replay.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.