Lorcana references are property of Disney.
A three-mana 3/3 menace body is more or less what we expect these days, with the looting ability not being all that exciting in isolation
For example, if youre running a blue, black, and green deck, you likely want a Dimir Signet and a Golgari Signet
Willpower: Willpower is a number inside a shield on the right side of the card, and it tells you how much damage a card can take before its banished (removed from the game)
This can create a particularly deadly strategy alongside cards that can grant additional utility to the Thopter tokens that Pia Nalaar creates
The Ruby/Sapphire deck, for instance, relies on the use of items whether they are on the field or not