Bozren, King of Greed

Defender
At the beginning of your upkeep, you may discard a card. If you do, draw a card.
Goblins you control have "{t}, discard a card: Draw a card."
Whenever you discard a card, you may pay {1}. If you do, you may create a colorless Coin artifact token with "sacrifice this artifact: Add {1} to your mana pool. Activate this ability only as a sorcery."