Considering that you'll get one of these cards in about one in every four boxes, this means that the Invocations add about $11 in value to the expected value of a box of Amonkhet , bringing the total box EV up from $77 to $88, which is approximately $10 a box less than either set from Kaladesh block and way less than high-EV sets like Khans of Tarkir or Battle for Zendikar
Given that, there are two schools of thought when it comes to preparing for a tournament
Lets open it up and see what we get
Implementing this into Arenas user interface would require major overhauls
Instead of merely, making the creature sacrifice itself to counter a spell, we used the same trick we used on Ravenous Baloth and Wall of Mulch
Theyre mostly vanilla cards, and in this case especially theyre low-cost ones to play early and then Shift over