Tim's Staff

Equipped creature has "{r}: This creature deals 1
damage to each creature your opponents control.
Activate this ability only once each turn."

When equipped creature attacks, create a red Aura enchantment token named Tim's Impulse and attach
it to target player. That token has enchant player
and "At the beginning of enchanted player's upkeep,
that player flips a coin. If they lose the flip,
enchanted player takes 1d4 damage."
Equip {1}{r}