Flying
Whenever Yusri, Fortune's Flame attacks, choose a number between 1 and 5. Flip that many coins. For each flip you win, draw a card. For each flip you lose, Yusri deals 2 damage to you. If you won five flips this way, you may cast spells from your hand this turn without paying their mana costs.
If an effect allows you to cast a spell with {X} in its cost without paying its mana cost, you must choose 0 for the value of X.
When you cast a spell without paying its mana cost, you may still pay additional costs. If any additional costs are required, you must pay them.