Goblin Potionmaker

{u/r}: Choose a creature you control. If you choose a creature other than Goblin Potionmaker, as an additional cost to use this ability, tap Goblin Potionmaker. Roll a six-sided die.
1: The creature gets dealt 2 damage.
2: The creature gets dealt 1 damage.
3: Nothing happens.
4: The creature gets +1/+0 until end of turn.
5: The creature gets +1/+1 until end of turn.
6: The creature gets +2/+1 until end of turn.