Bohnanza!, Trader of Beans

When Bohnanza!, Trader of Beans enters the
battlefield, all players become Bean Farmers.

Whenever an artifact an opponent controls is
put into a graveyard, add {x}mana of any
colour to your mana pool until the end of your
next turn, where {x}is the amount of
counters on that artifact.

You can control up to 2 Bean Tokens.