The Gitrog, Ravenous Ride

Rulings

"Saddle N" means "Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery." — "Saddled" isn't an ability that a creature has. It's just something true about that creature. It won't stop being saddled until the turn ends or it leaves the battlefield. — An ability that triggers when a creature "attacks while saddled" will trigger only if that creature was saddled when it was declared as an attacker. — Creatures with saddle can attack or block as normal even if they aren't saddled. — If a permanent becomes a copy of a saddled Mount, the copy won't be saddled. — Putting one or more land cards onto the battlefield with The Gitrog's triggered ability doesn't count as playing a land. It can put land cards onto the battlefield even if you've already played your land for the turn. — Use the power of the sacrificed creature as it last existed on the battlefield to determine the value of X. — You may activate a permanent's saddle ability even if that permanent is already saddled.