Possibility Storm RIX #3 puzzle: the thopters in the battlefield have summoning sickness
Original report: https://www.slightlymagic.net/forum/viewtopic.php?f=26&t=22137&start=30#p224541
Possibility Storm puzzle: http://www.possibilitystorm.com/wp-content/uploads/2018/02/RIX3-Feb-5.jpg