not mod or anything, but if you go on summoning portal info -> mercy system tab there you see mercy system kicks in after 12 summons without lego increasing chances by 2 % per shard. Since it starts with 6% that means you are currently 6+ (7x2) = 20% chance to pull lego off sacred shard, which is sad, and awful rng, but it happens. Im also about 10 sacred in also so far, never saw any leggo off sacred so far ever since i started. My advice would be skip events like this, keep sacred so you can complete the fusions etc if you are f2p and go after lego's on double times or 10x if some crazy good lego is there .. have a good one friend..!