Jingling coins beckon many an eager hand.

Curse of Opulence

Enchant player
Whenever enchanted player is attacked, create a Gold token. Each opponent attacking that player does the same. (A Gold token is an artifact with "Sacrifice this artifact: Add one mana of any color.")

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March of the Machine Commander

Commander Legends: Battle for Baldur's Gate

The List

Commander 2017

Enchant player
Whenever enchanted player is attacked, create a colorless artifact token named Gold. It has "Sacrifice this artifact: Add one mana of any color to your mana pool." Each opponent attacking that player does the same.

A player is attacking another player if they control a creature that's attacking that player. If no creatures are attacking the enchanted player as a Curse's ability resolves (most likely because they've left the battlefield), only the Curse's controller performs its actions.

Curse of Opulence's triggered ability resolves after attackers have been declared. Any costs to attack must have already been paid before the attacking player creates the Gold.

Each Curse's ability triggers only once, no matter how many creatures are attacking the enchanted player.

If you enchant yourself with one of these Curses, you'll get its effects whenever another player attacks you.

The triggered ability of these Curses won't trigger if only a planeswalker controlled by the enchanted player is attacked.