Lullmage Mentor + Parallel Lives + Mondrak, Glory Dominus + Elspeth, Storm Slayer

Lullmage Mentor

Parallel Lives

Mondrak, Glory Dominus

Elspeth, Storm Slayer

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 fascinating loop turns Lullmage Mentor into an absolute fortress against your opponents' spells. When you tap seven untapped Merfolk to activate Lullmage Mentor's counter ability, the resulting trigger would normally create just a single Merfolk token, but the combined replacement effects of Parallel Lives, Mondrak, Glory Dominus, and Elspeth, Storm Slayer multiply that single token creation into an overwhelming flood of eight new Merfolk at once. Since those newly created tokens are immediately available—and you only need seven to pay the cost—you can repeat this cycle to infinitely counter every spell your opponents try to cast while generating an endless army.