Lullmage Mentor + Adrix and Nev, Twincasters + Anointed Procession + Exalted Sunborn

Lullmage Mentor

Adrix and Nev, Twincasters

Anointed Procession

Exalted Sunborn

How it works

1. Whenever an opponent casts a spell, activate Lullmage Mentor by tapping seven untapped Merfolk, countering that spell.
2. Lullmage Mentor triggers, creating a total of eight 1/1 Merfolk creature tokens.
3. Repeat.

This potent lock relies on Lullmage Mentor acting as both the engine and the payoff, using its activated ability to counter an opponent's spell while simultaneously triggering its own first ability to generate a 1/1 Merfolk creature token. The magic truly scales thanks to the replacement effects of Adrix and Nev, Twincasters, Anointed Procession, and Exalted Sunborn, which stack together to exponentially multiply that single token into a flood of eight new Merfolk. Because you now control more than enough bodies, you can immediately tap seven of those newly minted Merfolk to pay for Lullmage Mentor's ability again whenever another spell threatens you. This creates a self-sustaining loop that completely locks your opponents out of resolving spells while swarming the board with a near-infinite army of tapped tokens.