Sanctum of the Marred

When Sanctum of the Marred enters the battlefield, tap X target creatures.
At the beginning of your end step, put a lore counter on Sanctum of the marred, and then tap X creatures.
Exile Sanctum of the Marred, target creature gains +8/+8 double strike, vigilance, intimidate, indestructible and haste until end of turn. Activate this ability only if you have three or lore counters on Sanctum of the Marred