If a Wizard you control entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Naban doubles the enter-the-battlefield triggers of Wizards you control, so you build a board of value Wizards and blink/recur them repeatedly for massive card advantage, bounce, counter generation, or damage. Early turns you ramp and protect Naban, then chain flicker effects and Wizard ETBs to snowball control of the game until you assemble a combo or grind opponents out.
Doubles powerful Wizard ETBs for explosive value engines
Cheap two-mana commander that comes down early and rebuilds quickly
Enables several compact infinite combos in mono-blue
Mono-blue gives access to the best counters, card draw, and tutors
Heavily commander-dependent; removing Naban shuts off the doubling
Mono-blue lacks efficient creature and artifact/enchantment removal
Fragile Wizard bodies are vulnerable to board wipes
Vulnerable to graveyard hate and to opponents racing you on the board
Cheap Wizard that draws extra cards with every doubled, flickered entry.
Add fast mana (Sol Ring, Mana Crystals, mana rocks) and free protection like Heroic Intervention substitutes such as counterspell backup to keep Naban alive. Tighten the deck into compact two-card combos (Naru Meha + Ghostly Flicker + a payoff like Altar of the Brood) and trim slow Wizards for efficient interaction. Include tutors like Mystical Tutor and Fabricate, plus recursion such as Mystic Sanctuary, to find and reassemble loops faster.