Riardon, Mielekki's Chosen

Double Strike, Vigilance
Other elves you control get +1/+1, and have First Strike while attacking.
When Riardon, Chosen of Mielekki deals combat damage to a player, if you have less then 10 life, you may pay {2}{u}{b}. If you do, sacrifice it, and search your library for Riardon, Voidchosen, then put it on the battlefield.