Kai, the Boundless Seer

When Kai, the Boundless Seer enters the battlefield, gain X life, and scry X cards
Whenever you gain 3 or more life, draw 2 cards.
Each opponent loses 1 life, each time you
draw a card, or scry.
{1}{u}: scry 1
{w}{w}{w}{w}: you gain 4 life