The effects of two Temple Altisaurs won't reduce the damage from one source below 1 damage.
Temple Altisaur
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 sources would deal damage to another Dinosaur you control, all but 1 damage from each of those sources is prevented.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Daarken
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