Case of the Gateway Express (MKM) #8 [EN/F] s/o

{1}{W} · Enchantment — Case · When this Case enters, choose target creature you don't control. Each creature you control deals 1 damage to that creature. To solve — Three or more creatures attacked this turn. (If unsolved, solve at the beginning of your end step.) Solved — Creatures you control get +1/+0. · Illustrated by Edgar Sánchez Hidalgo · Murders at Karlov Manor #8 · EDHREC rank 16665 · Magic: The Gathering, MTG