Because Spy Kit gives the creature the name of every nonlegendary creature card, no nonlegendary creature spells can be cast.

Players cannot cast nonlegendary creature spells

Cornered Market

Spy Kit

Whenever a player casts a nonlegendary creature spell, Bazaar of Wonders' second ability triggers, countering that spell, as the creature with Spy Kit attached will share a name with that spell.

Counter all nonlegendary creature spells

Bazaar of Wonders

Activate Zur by paying {1}{W}, causing Promising Stairs to become a creature.
Activate Spy Kit's equip ability by paying {2}, attaching it to Promising Stairs.
At the beginning of your next upkeep, Promising Stairs triggers, causing you to surveil 1 and win the game.

Win the game at the beginning of your next upkeep

Zur, Eternal Schemer

Central Elevator // Promising Stairs

At the beginning of your upkeep, Promising Stairs triggers, causing you to surveil 1 and win the game.

Combos with "Spy Kit"