Squall, SeeD Mercenary (Borderless) (Surge Foil) [FIN - 547] Aether Revolt if that spell's mana cost

if that spell's mana cost or that ability's activation cost contains X

they'll ride off into the sunset

Rules Text Contains: Flying Whenever you cast a spell from exile

the Undercrypt

Rules Text Contains: You may play lands from your graveyard

Squall, SeeD Mercenary (Borderless) (Surge Foil) [FIN - 547] Aether Revolt if that spell's mana costRarity: R #: 547 Creature Type or Sub Type: Legendary Creature Human Knight Mercenary P: 3 T: 4 Rules Text Contains: Rough Divide Whenever a creature you control attacks alone, it gains double strike until end of turn. Whenever Squall deals combat damage to a player, return target permanent card with mana value 3 or less from your graveyard to the battlefield.