Cereval, Fey Knight

Cereval, Fey Knight gets +1/+0 for each other legendary creature you control.
When Cereval, Fey Knight deals combat damage to a player, if he dealt 10 or more damage to that player this turn, you may pay {2}{w}{b} and sacrifice him. If you do, search your library for Cereval, Dark Redeemer and put it on the battlefield.