Avacyn, Guardian Angel [Magic 2015] Vintage {1}{W}{B}: Shambling Vent becomes a

{1}{W}{B}: Shambling Vent becomes a 2/3 white and black Elemental creature with lifelink until end of turn

Haste (This creature can attack and {T} as soon as it comes under your control

Set: Magic Origins Prerelease Promos Type: Creature — Elemental Rarity: Rare Cost: {5}{G}{G} This spell can't be countered

Those creatures fight each other

return it to the battlefield under your control with an additional +1/+1 counter on it at the beginning of the next end step

Avacyn, Guardian Angel [Magic 2015] Vintage {1}{W}{B}: Shambling Vent becomes aSet: Magic 2015 Type: Legendary Creature Angel Rarity: Rare Cost: {2}{W}{W}{W} Flying, vigilance {1}{W}: Prevent all damage that would be dealt to another target creature this turn by sources of the color of your choice. {5}{W}{W}: Prevent all damage that would be dealt to target player or planeswalker this turn by sources of the color of your choice.