This deck pulled most of the Abzan +1/+1 counters cards from Khans of Tarkir block (e.g., Abzan Falconer) and the Simic +1/+1 counters cards from Return to Ravnica block (e.g., Vorel of the Hull Clade) and smashed them into a delightful pile of weird creatures that grow out of hand fast
The approach that works best for you will be subjective
Julius Jumblemorph Feisty Spikeling Fire-Belly Changeling Flock Impostor Game-Trail Changeling Gangly Stompling Ghostly Changeling Gladewalker Ritualist Graveshifter Guardian Gladewalker Impostor of the Sixth Pride Irregular Cohort Littjara Glade-Warden Littjara Kinseekers Masked Vandal Mirror Entity Mischievous Sneakling Mistform Ultimus Mistwalker Moonglove Changeling Moritte of the Frost Morophon, the Boundless Mothdust Changeling Mutable Explorer Omni-Changeling Omo, Queen of Vesuva Prideful Feastling Realmwalker Rooftop Percher Shapesharer Sizzling Changeling Skeletal Changeling Taurean Mauler Three Tree Mascot Turtleshell Changeling Universal Automaton Unsettled Mariner Valiant Changeling Venomous Changeling War-Spike Changeling Webweaver Changeling Woodland Changeling
At the beginning of your end step, you may exile another target creature you control, then return that card to the battlefield under its owner's control
Decklist: 1 Satoru Umezawa
(He also retains any other card types or subtypes he may have had.) Each subtype is correlated to the proper card type: planeswalker is only a type (not a creature type), and Human, Soldier, and Ally are just creature types (not planeswalker types)
