Lullmage Mentor + Adrix and Nev, Twincasters + Doubling Season + Exalted Sunborn

Lullmage Mentor

Adrix and Nev, Twincasters

Doubling Season

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 locking engine lets you completely shut down your opponents' spells by leveraging Lullmage Mentor's activated ability to counter anything they cast. Thanks to the compounding token-doubling effects of Adrix and Nev, Twincasters, Doubling Season, and Exalted Sunborn working together, that single counterspell generates an explosive output of eight Merfolk tokens instead of just one. You can immediately tap seven of those newly minted Merfolk to pay the activation cost for Lullmage Mentor again, leaving you with a rapidly growing army while infinitely looping your counters to lock the board out entirely.