Guardian of the Gates

Whenever Guardian of the Gates attacks, return
target gate from your graveyard to the battlefield
tapped, then if you control 10 or more gates,
Guardian of the Gates gets +4/+4, flying,
deathtouch, and lifelink until end of turn.
Whenever a gate enters the battlefield under
your control, gain 1 life and draw a card. This
ability triggers only once each turn.