Amateur. Illustrated by Scott M
The pros being that it is a creature that can potentially have an Indestructible counter on it that can attack and block
Yuan Shao, the Indecisive ($133) Here's an expensive horsemanship commander, that aids your attackers by forbidding double and multi- blocks
Sometimes the threat of interaction is just as strong as the card itself

Aboshan's Desire Advanced Hoverguard Aerie Mystics Alexi's Cloak Algae Gharial Arcane Lighthouse Argothian Enchantress Armored Guardian Aspect of Mongoose Autumn Willow Benthicore Blastoderm Blurred Mongoose Cairn Wanderer Calciderm Calcite Snapper Cephalid Inkshrouder Citanul Centaurs Cloak and Dagger Clout of the Dominus Control Win Condition (playtest) Crashing Centaur Crystalline Sliver Deadly Grub Deadly Insect Deep Spawn Deft Duelist Diplomatic Immunity Drill-Skimmer Eladamri, Lord of Leaves Elvish Lookout Empyrial Archangel Favorable Destiny Form of the Squirrel Fountain Watch Frost Raptor General's Kabuto Ghosthelm Courier Giant Crab Giant Solifuge Gigapede Gilded Light Glimmering Angel Glimpse, the Unthinkable (playtest) Greater Auramancy Hada Spy Patrol Hanna's Custody Hawkeater Moth Helix Pinnacle Hisoka's Guard Homarid Warrior Humble Budoka Indomitable Archangel Inkwell Leviathan Isleback Spawn Ivory Mask Jolrael's Centaur Kalonian Behemoth Kashi-Tribe Elite Kodama of the North Tree Lightning Greaves Mage's Guile Master of the Wild Hunt Avatar Minotaur Illusionist Mist Leopard Moniker Mage Morphling Multani, Maro-Sorcerer Mystic Veil Naya Hushblade Neurok Commando Neurok Stealthsuit

Both put counters on creatures, invalidating their ability to attack you or planeswalkers you control, but Nils works more like a Ghostly Prison effect based on the number of counters creatures have