Archangel Avacyn | Legendary Creature | Angel | Flash
Flying, vigilance
When Archangel Avacyn enters the battlefield, creatures you control gain indestructible until end of turn.
When a non-Angel creature you control dies, transform Archangel Avacyn at the beginning of the next upkeep. | James Ryman
Emissary of the Sleepless | Creature | Spirit | Flying
When Emissary of the Sleepless enters the battlefield, if a creature died this turn, create a 1/1 white Spirit creature token with flying. | Igor Kieryluk
Reaper of Flight Moonsilver | Creature | Angel | Flying
Delirium — Sacrifice another creature: Reaper of Flight Moonsilver gets +2/+1 until end of turn. Activate only if there are four or more card types among cards in your graveyard. | Magali Villeneuve
Sigarda, Heron's Grace | Legendary Creature | Angel | Flying
You and Humans you control have hexproof.
{2}, Exile a card from your graveyard: Create a 1/1 white Human Soldier creature token. | Chris Rahn