Bloodsmith

when Bloodsmith enters the battlefield draw a card and gain 3 life.
at the beginning of your upkeep pay any amount of life, then create a colourless token artifact equipment named "Rite-knife" with blood counters equal to the amount of life payed this turn on it and with "Equipped creature gains double strike and lifelink. Equipped creature gets +X/+0 where X is the amount of blood counters on Rite-knife" and "equip: {2}"