Mercer Frey, Guildmaster

At the beginning of combat on your turn, you
may sacrifice a gold. If you do, target creature
gains shadow until end of turn.
Whenever one or more Thieves you control deals combat damage to an opponent, choose one:
-Gain control of target artifact that player
controls.
-That player sacrifices a noncreature permanent.
-Create a gold token.
{t}: Sacrifice an non-Gold artifact: create a Gold
token.