Cheapest priced copy (The Lost Caverns of Ixalan Commander): $1.49 at Card Kingdom, near mint, their price list as of .
Temple Altisaur 
Creature — Dinosaur · 3/4 · Rare · Rivals of Ixalan · #28
If a source would deal damage to another Dinosaur you control, prevent all but 1 of that damage.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $1.49 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 138 | Rare | $1.49 | — |
| Rivals of Ixalan Promos | 28s | Rare | — | $11.99 |
| Rivals of Ixalan | 28 | Rare | $1.49 | $7.99 |
4 rulings from Wizards of the Coast
- 19 January 2018The effects of two Temple Altisaurs won't reduce the damage from one source below 1 damage.
- 19 January 2018Combat 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.
- 19 January 2018If multiple sources would deal damage to another Dinosaur you control, all but 1 damage from each of those sources is prevented.
- 19 January 2018If 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.