Card Rulings:Gate Guardian

Unofficial

 * You can add "Gate Guardian" to your hand with "Arsenal Summoner" because it has "Guardian" in it's card name.

Mentions in Other Rulings

 * Reasoning: You can Special Summon a high-level monster like "Dark Magician" with "Reasoning", but not Special Summon-only monsters like "Gate Guardian", Ritual Monsters, etc.