Caustic Bronco

Creatures with saddle can attack or block as normal even if they aren’t saddled.

If the revealed card doesn’t have a mana cost (because it’s a land card, for example), its mana value is 0.

If the revealed card is a split card, that card’s mana value is based on the combined mana cost of its two halves.

If Caustic Bronco isn’t on the battlefield as its triggered ability resolves, use whether it was saddled or not before it left the battlefield to determine who loses life.

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.

If the revealed card’s mana cost includes {X}, X is 0 for the purpose of determining its mana value.