Melisk, Eye of Obzedat

Deathtouch, lifelink
At the beginning of your upkeep, reveal the top card of your library. If it's white you gain 2 life, but if it's black target opponent loses 2 life.
Discard a card, sacrifice Melisk: Target creature gains deathtouch until end of turn.
Partner (You can have two commanders if both have partner.)