For three mana you get a souped-up mana dork that ramps you by two and fixes perfectly, provided youre casting Dragons of course
This will give your spells more effectiveness and overall impact on the board

Arcades' Big Butts Arcades, the Strategist | Illustration by Even Amundsen Commander (1) Creatures (34) Amaranthine Wall Angelic Wall Consulate Skygate Crenellated Wall Excavated Wall Glacial Wall Hover Barrier Jeskai Barricade Jungle Barrier Mnemonic Wall Mobile Fort Overgrown Battlement Quicksilver Wall Steel Wall Sunscape Familiar Wall of Air Wall of Denial Wall of Junk Wall of Shards Wall of Stolen Identity Wall of Tanglecord Wall of Tears Axebane Guardian Brawn Colossus of Akros Drift of Phantasms Flumph Hornet Nest Perimeter Captain Riptide Turtle Sidar Kondo of Jamuraa Tetsuko Umezawa, Fugitive Towering Titan Wonder Instants (9) Akroma's Will Bant Charm Barrier Breach Counterspell Eerie Interlude Heroic Intervention Krosan Grip Negate Tower Defense Enchantments (6) Assault Formation High Alert Propaganda Reconnaissance Reconnaissance Mission Serra's Blessing Artifacts (8) Arcane Signet Commander's Sphere Dragon Throne of Tarkir Meekstone Mirror Shield Peregrine Mask Simic Signet Sol Ring Lands (42) Azorius Chancery Azorius Guildgate Command Beacon Command Tower Evolving Wilds Forest x10 Island x10 Opal Palace Overgrown Farmland Plains x9 Prairie Stream Rogue's Passage Seaside Citadel Selesnya Guildgate Temple of Mystery Tranquil Cove One of few commanders that allows the innate ability to use toughness in combat, Arcades, the Strategist offers a super unique combat-focused deck

If you have a card like Hagra Diabolist around, you might kill your opponent just with the allies that enter from Appa's ability
As long as you have a ninja on the battlefield, Yuffie, as a Commander, will facilitate exceptional resource gain and combat prowess
Creature removal for green and blue, enchantment removal for black and red, hand disruption for the non-black decks etc