You will find cards from 1 to cards in the 1,000s
Constructs generally want other constructs so here are some solid ways to construct constructs, with both commanders and non-commanders: Urza, Chief Artificer, Mishra, Eminent One, Vihaan, Goldwaker, Dollhouse of Horrors, Digsite Engineer, and Simulacrum Synthesizer
After the exchange, Tree of Perdition would be a 2/9 creature (its toughness became 7, which was then modified by Cultists Staff) and the players life total would be 15
K'rrik, Son of Yawgmoth Few cards match the life loss K'rrik, Son of Yawgmoth enables
Other stronger attacks will Paralyze a Pokemon without the need to flip a coin
#5 The idea that I could use my pro points to slab up some random favorite cards is very interesting - I would never trust them with a very valuable card but this is certainly a simplistic way for people to get the service provided #6 If they provide a good service, and cards dont randomly go missing, who cares