Avacyn, Guardian Angel

(T: Add U.)

+1: Until end of turn, up to one target creature gets +1/+1 and gains first strike, vigilance, and lifelink. −2: Put a +1/+1 counter on each creature you control and a loyalty counter on each other planeswalker you control. −7: You get an emblem with "If a source would deal damage to you or a planeswalker you control, prevent all but 1 of that damage."

Whenever you gain life, put a +1/+1 counter on this creature.

Enchant creature Enchanted creature has double strike. (It deals both first-strike and regular combat damage.)

When this creature enters, you may search your graveyard, hand, and/or library for an Aura card and put it onto the battlefield attached to this creature. If you search your library this way, shuffle.

Target player gains 2 life for each creature on the battlefield.

Sliver creatures you control have "When this creature enters, you may exile target creature an opponent controls until this creature leaves the battlefield."

This creature gets +1/+1 as long as you control an Island. 3U: Tap target creature.