The Rivers of Styx

Pay 1 life: Add {w} to your mana pool. Target creature's base power becomes 2. (As long as this creature is on the battlefield.)
Pay 1 life: Add {u} to your mana pool. Draw a card.
Pay 1 life: Add {b} to your mana pool. Target creature gains lifelink until end of turn.
Pay 1 life: Add {r} to your mana pool. Deal 3 damage to target creature.
Pay 1 life: Add {g} to your mana pool. Target creature gets +1/+1 until end of turn.