Vein, Memoria of Life

Partner with Teir, Soul's Lament
If your life total is above your
starting life total pay {b}{u}{1}, reveal the top
4 cards of target opponent's library.
You may cast any of those cards by
paying life equal to their mana cost.
If Teir, Soul's Lament is on the
battlefield under your control both creatures gain doublestrike.