In total, 36 of the 120 cards qualify as chase-tier rarities , so packs are livelier than the headline chases alone suggest
You can think of cards like Thief of Blood and Mikaeus, the Lunarch as counter movers, but thats not actually what those cards are doing in the context of the rules
Spending some time farming Shop Tickets in online battles can also let you buy more Pack Hourglasses from the shop
Those cards are considered to be "used to craft" that permanent as long as they remain exiled and the permanent remains on the battlefield, even if the permanent's controller changes or some of its characteristics change (because of a copy effect, for example.) If the materials required include multiple objects, you may exile some of them from among permanents you control and the rest from among cards in your graveyard
It is the kind of card I find I rarely fail to play if I have access to it
Can You Activate a Creature's Ability Before It Dies