Skrelv's Hive even gives you survivability as the game progresses
They don't copy whether that creature was tapped or untapped, whether it had any counters on it, whether it had any Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on
Considering all the other things these permanents do, Im a little surprised
If youre about to pull off a combo or just cast a spell thats important for your game, this can be the difference between a win and a loss
If on the other hand Buccaboo is removed from the field before its auto-ability resolves, it cant be put into the Break Zone and therefore cannot make your opponent discard 2 cards
LIGHT 26-121LRa-la If Ra-la acquires a rule that prevents it from being dulled by an opponents Summons or abilities, the replacement effect where the damage you take is reduced to zero and Ra-la is dulled is still applied to it