Keeper of Plowshares

When Keeper of Plowshares enters the
battlefield, and at the beginning of your upkeep, choose one that hasn't been chosen —
• Create three 1/1 white Bird creature tokens
with flying.
• Create a 1/1 white Cat creature token with
lifelink.
• Populate
{bull} Exile Keeper of Plowshares. You gain 3 life.