Ordeal of Nylea [Theros] Snake When the bey runs

When the bey runs

Whenever Siege Dragon attacks

but first they'd have to settle their long-standing debate on how to classify them

Set: Magic 2012 Type: Sorcery Rarity: Common Cost: {2}{B} Creatures you control gain intimidate until end of turn

Set: Core Set 2019 Type: Sorcery Rarity: Common Cost: {1}{U} Up to two target creatures can't be blocked this turn

Ordeal of Nylea [Theros] Snake When the bey runsSet: Theros Type: Enchantment Aura Rarity: Uncommon Cost: {1}{G} Enchant creature Whenever enchanted creature attacks, put a +1 +1 counter on it. Then if it has three or more +1 +1 counters on it, sacrifice Ordeal of Nylea. When you sacrifice Ordeal of Nylea, search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.