Diarmuid, Lancer

Wither, Double Strike
At the beginning of your upkeep, pay {w}{b} or
sacrifice Diarmuid.
Diarmuid loses Wither until he deals combat
damage or until end of turn: The next time
Diarmuid deals combat damage to a creature or
player this turn, phase out all permanents
attached to that creature or player and all
enchantments controlled by that player