Hawkeye's Bow + Kelpie Guide + Clever Conjurer Combo

All permanents on the battlefield (Hawkeye's Bow attached to either Kelpie Guide or Clever Conjurer on the battlefield and Kelpie Guide and Clever Conjurer without summoning sickness on the battlefield).

Activate Kelpie Guide by tapping it, targeting Clever Conjurer.

If Kelpie Guide has Hawkeye's Bow attached to it, Hawkeye's Bow triggers, dealing 1 damage to each opponent.

Resolve the Kelpie Guide ability, untapping Clever Conjurer.

Activate Clever Conjurer by tapping it, targeting Kelpie Guide.

If Clever Conjurer has Hawkeye's Bow attached to it, Hawkeye's Bow triggers, dealing 1 damage to each opponent.

Resolve the Clever Conjurer ability, untapping Kelpie Guide.

Repeat.

Infinite damage