Power, Maniacal Usurper

This spell costs {x} less to cast, where X is the number of abilities on your More Power emblem.

Devour 2

Whenever Power, Maniacal Usurper deals combat damage
to a player, you may sacrifice it. When you do, you control that player during that player's next turn.

If Power would be put into a graveyard from anywhere, reveal it and shuffle it into its owner's library instead.