Inspire is a Keyword on Troop cards that triggers an effect when another troop with cost equal to or greater than the card with Inspire enters play under your its owner's control. The actual effect varies from card to card.
Inspire has, thus far, only been previewed on Human-aligned cards from the Sapphire, Diamond, and Ruby shards. It may be considered the Human racial keyword.
Example card: Kraken Guard Mariner