Shell Shield
This little monkey pirate sells for around $30 and is hugely popular in Commander, Cube, and even eternal formats like Modern
Whatever it is, it will be non-foil
She also has a handy added ability of granting some survivability in the face of wraths

The deck: Rogue Tribal Comparative Analysis 34 Lands 7 Ramp : Dimir Signet, Arcane Signet, Sol Ring, Patchwork Banner, Frogtosser Banneret, The Water Crystal, Mari, the Killing Quill 11 Target Removal : Azure Beastbinder (kinda), Thieves Guild Enforcer (kinda), Feed the Swarm, Thought Collapse, Drown in the Loch, Enigma Thief, Thieving Skydiver, Didnt Say Please, Hagra Mauling, Agent of Treachery, Jwari Disruption 2 Board Wipes : Crippling Fear, Singularity Rupture 3 Graveyard Recursion : Halo Forager, Back in Town, Bloodline Bidding 4 Graveyard Hate : Bojuka Bog, Dauthi Voidwalker, Halo Forager, Mari, the Killing Quill 2 Tutors : Varragoth, Bloodsky Sire, Ringsight 5 Protection : Cloak and Dagger, Thought Collapse, Drown in the Loch, Jwari Disruption, Lazav, Dimir Mastermind (self-protection) 10,5 Card Draw : Anowon, the Ruin Thief, Shoreline Looter, Mari, the Killing Quill, Notion Thief, Court of Cunning, Reconnaissance Mission, Coastal Piracy, Ghostly Pilferer, Merfolk Windrobber (1/2), Sygg, River Cutthroat, The Destined Thief 5+* Finishers/ Surprise /Alternate win conditions : Duskmantle Guildmage, Bloodchief Ascension, Syr Konrad, the Grim, Notorious Throng, Bruvac the Grandiloquent * see also The Ultimal Lethal Combo Tracker table As we see form the comparative analysis, the rates per category are good except in ramp category where we see a much lower number than optimal min value

Kerplunk provides trample to all your creatures, not just Chocobos, so your creatures with naturally high stats become bigger threats