When the chosen player draws a card with the chosen name, sacrifice this artifact
Feldon of the Third Path can enable some explosive interactions, and Sams looking to get value creatures into his graveyard quickly
This is true for creature removal, but doubly so for other types, meaning powerful artifacts often run away with games for lack of proper answers
Anyway, its an okay green creature, and it has theoretical combo potential with its bounce-to-hand ability, but thats likely not worth the effort
Thats already a strong proposition, which is better when tacked onto a strong 5/4 body
However, if a Lion Umbra you control is attached to a creature you don't control and that creature has no Auras controlled by that creature's controller attached to it, no Equipment attached to it, and no counters on it, Lion Umbra will be put into its owner's graveyard due to being attached to an illegal object the next time state-based actions are performed