Rat Technician

Firststrike, Haste, Hexproof, Flash
When Rat Technician enters the battlefield deal 3 damage to each other non-rat creature. When a rat enters the battlefield add one mana of any color to your mana pool. When you take damage or lose life deal two damage to target creature or player. Whenever you tap a land add {b} to your mana pool.
{t}: Deal 1 damage to target creature or player. Draw a card.