In competitive play, Kid leader enables a grindy midrange strategy you can push offense with a heavy hitter (say, a 7-cost), knowing Kid will re-activate it as a blocker to protect you on the opponents turn
Gone Missing : limited, and at one more mana than Griptide

Bushroot - Evil Botanist 93/204 Mother Gothel - Evil as Ever 94/204 Tod & Copper - Best of Friends 95/204 Rapunzel - Escaping the Tower 96/204 Cetus - Mighty Serpent 97/204 Mushu - Stealthy Dragon 98/204 Carl Fredricksen & Russell - Intrepid Explorers 99/204 Mickey Mouse & Minnie Mouse - Adventuring Duo 100/204 Rapunzel & Flynn Rider - Unlikely Pair 101/204 To Wither a Flower 102/204 Piercing Attack 103/204 Put That Thing Back 104/204 Scout Ahead 105/204 Potato 106/204 My Adventure Book 107/204 Vine Pod 108/204 Paradise Falls - Exotic Destination 109/204 Dash Parr - Super Fast 110/204 Yzma - Choosy Customer 110/204 Yzma - Choosy Customer (Foil) 111/204 Kuzco - Picky Customer 111/204 Kuzco - Picky Customer (Foil) 112/204 The Bear - Territorial Animal 113/204 Carl Fredricksen - On the Move 114/204 Dash Parr - Dodgeball Dynamo 115/204 Gaston - Created by the Vine 116/204 Colonel Hathi - On the March 117/204 Splodyhead - Experiment 619 118/204 Pacha - Panicked Customer 119/204 Sun Yee - Red Panda Spirit 120/204 Grandma Wu - Fierce Red Panda 121/204 King Louie - King of Swing 122/204 Beast - Fierce Defender 123/204 Randall Boggs - Envious Coworker 124/204 Donald Duck - Vineling Rider 125/204 Meilin Lee - Popular Red Panda 126/204 Tigger - Hunny Barbarian 127/207 Boo - Energetic Child 128/204 Sulley - Protective Monster 129/204 Ming Lee - Giant Red Panda 130/204 Captain Hook - Conniving Pirate 131/204 Peter Pan - Vine Duelist 132/204 Belle & Beast - Certain as the Sun 133/204 Dash Parr & Violet Parr - Super Siblings 134/204 Red Moon Ritual 135/204 Red Alert 136/204 RAHR

Still, its a really strong ability, but not even the reason Im excited by this card
Technology is always getting better and you can be sure therell be high-quality holograms and Foils in the future
II Put a number of +1/+1 counters on target creature you control equal to the mana value of the exiled card