Axe Nightmare Executioner

Menace

If a land was destroyed this turn or last turn, it gains Mindbreak and 3 Insight until end of turn.

{b}, {t}: Nightmare Executioner attacks target creature, gain {s}. You may repeat this. After X repetitions, put X Stun counters on it and tap it. It doesn't untap while it has a Stun counter; remove
one instead during your untap step.