Zion, Arcane Mage

Whenever you would add mana to your mana pool, add one extra mana of any type to your mana pool.
•{t} - Add 1 mana of any type to your mana pool. Flip a coin, if heads, {ut}
•{4} - This ability's mana cost can only be payed by mana generated by Zion, Arcane Mage this turn. Deal 2 damage to any target.