Shady Banneret

{2}: Retire an artifact you control. Shady
Banneret gets +1/+0 and has first strike until
the end of turn. (The retired card goes in your
graveyard; you gain 2 life.)
Whenever a creature dies, put a Gold Coin
artifact token with "{1}: Sacrifice this card. Add
one mana of any color to your mana pool" on
the battlefield.