You can get hourglasses from battle task completions tied to each tier
Since BK has monsters such as "BK Headgear" and "BK Switch Hitter" whose effects can only be activated by summoning, I am very grateful for the addition of this card's summoning right
Marvin, Murderous Mimic Marvin, Murderous Mimic has all activated abilities of creatures you control is the rules text of a 2-drop toy that, being a colorless creature, can go into every deck
Before you point to Lightning Bolt, Path to Exile, or Fatal Push, those are all conditional or have a significantly larger drawback with no later Shriekmaw buyout, and theres as big a gap between free and one as there is between one and two
Not just the impossibly huge sheets of the rarest cards being fed into giant chopping machines, but the intricacy with which they are checked at ever stage