What does Polar Explorer do in AoE3?

Ships 1 Explorer's Dog; Hero: damage +50%, hit points +50%; Explorer: damage bonus against Guardian +2. The game says: "Improves your Russian Explorer in combat, improves his damage against guardians, and gives him a powerful canine companion."

Home City card

Polar Explorer

Polar Explorer (tech ID HCExplorerRussian) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Discovery Age. Effect: Ships 1 Explorer's Dog; Hero: damage +50%, hit points +50%; Explorer: damage bonus against Guardian +2.

Quick answers (3)

Which civilizations have the Polar Explorer card?: Russians.
What does Polar Explorer do in AoE3?: Ships 1 Explorer's Dog; Hero: damage +50%, hit points +50%; Explorer: damage bonus against Guardian +2. The game says: "Improves your Russian Explorer in combat, improves his damage against guardians, and gives him a powerful canine companion."
What is the tech ID of Polar Explorer?: HCExplorerRussian.

Improves your Russian Explorer in combat, improves his damage against guardians, and gives him a powerful canine companion.

What it does

Ships 1 Explorer's Dog(unit)
Hero: damage +50%, hit points +50%
Explorer: damage bonus against Guardian +2

What it hands over

1 × Explorer's Dogno train cost

Total ≈ 0 resources — units at their train cost, crates and animals at what they hold.

Cost: 1
Sent from: I
Times it can be sent: 1
Game ID: HCExplorerRussian

In these decks

RussiansI×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).