Shanna, Purifying Blade
Legendary Creature — Human Warrior
Lifelink
At the beginning of your end step, you may pay 
. If you do, draw X cards. X can't be greater than the amount of life you gained this turn.
Shanna had heard Sisay's legend all her life. Now it was time to forge her own.
Magali Villeneuve
Dominaria United (DMU)
• #218Rulings
You choose the value for X as the ability resolves.
(wotc • 2022-09-09)
Rulings
You choose the value for X as the ability resolves.
(wotc • 2022-09-09)