Each of the 36 Play Boosters contains 14 cards, and you're guaranteed to find a Retro-frame card in every single pack
Thats the default, but some blink effects specify whose control the creature returns under
Ungraded cards are very common, vary massively in their condition, and will only cost hundreds, rather than thousands, of dollars
Slash of Light might find value in Standard or even fringe Modern decks due to its cheap cost
It may contain small parts, sharp points, or other parts which are hazardous for children under the age of 16
Much like a traditional tutor, the best entomb effects are efficient so you dont spend too much extra mana finding your key card and have as few restrictions as possible