Alenai, Devotee of Asmalir

Whenever Alenai or another creature enters
the battlefield under your control, you may
gain half X life, where X is the number of
Green and White mana symbols in its mana
cost. If X is equal to its converted mana
cost, draw half X cards. If your devotion to
Green and White is seven or greater, round
up. Otherwise, round down.