"Kinjalli sculpted humans from clay, but the dinosaurs were carved from unyielding stone."
—Itzama the Crested

Temple Altisaur

If a source would deal damage to another Dinosaur you control, prevent all but 1 of that damage.

The Lost Caverns of Ixalan Commander

Rivals of Ixalan Promos

Rivals of Ixalan

Combat damage can be assigned to other Dinosaurs you control as normal, but most of that damage will be prevented. For example, if a 3/3 Dinosaur you control blocks a 5/5 creature with trample, the attacking player may assign 2 of that creature's combat damage to the player or planeswalker it's attacking and Temple Altisaur will prevent 2 of the 3 damage assigned to the defending Dinosaur.

If multiple replacement and/or prevention effects could apply to a Dinosaur you control, you choose the order in which to apply those effects. For example, if another effect will prevent 1 damage that would be dealt to a Dinosaur, you may apply Temple Altisaur's effect to prevent all but 1 of that damage and then apply the other effect to prevent that 1 damage.

If multiple sources would deal damage to another Dinosaur you control, all but 1 damage from each of those sources is prevented.

The effects of two Temple Altisaurs won't reduce the damage from one source below 1 damage.