I think its entirely reasonable to think you could cast Ledger Shredder on Turn 2 and have it be 3/5 or larger in a four-player game before your next turn
You are free to allocate the Buy-a-Box promos between different booster box types as you see fit
The same is true for first strike, double strike, deathtouch, hexproof, haste, indestructible, lifelink, menace, reach, trample, and vigilance
One tiny piece of something can get caught between the card and the cloth then wreck the holo with scratches
And we cant leave out the staples: Smothering TitheSmothering Tithe and Dockside ExtortionistDockside Extortionist
Double strike and 6 mana to get 6 cards discarded seems steep, and that sounds like the best case scenario, I think