Illicit Masquerade's last ability affects all creatures you control with impostor counters on them, not just ones that had impostor counters put on them with Illicit Masquerade's second ability
By casting it, players can deal 2 damage, and by casting another instant with 3 mana value or more, they can cast another, reaching the 4 damage required to give you a card draw during the end step
In the current meta, where convoke mechanics are widespread, the difference between a 1/1 and a 3/3 can be the difference between your opponent stabilizing or falling behind
Retreat If your Active Pokemon has taken severe damage and you want to preserve it for later use, on your turn, you may Retreat it back to the Bench
Teferi, Who Slows the Sunset Not given the respect of previous Teferis on release, Teferi, Who Slows the Sunset is slowly climbing in EDH decklists