Unraveling Mummy | Creature | Zombie | {1}{W}: Target attacking Zombie gains lifelink until end of turn.
{1}{B}: Target attacking Zombie gains deathtouch until end of turn. | Tomasz Jedruszek
Resolute Survivors | Creature | Human Warrior | You may exert Resolute Survivors as it attacks. (It won't untap during your next untap step.)
Whenever you exert a creature, Resolute Survivors deals 1 damage to each opponent and you gain 1 life. | David Palumbo
Bloodwater Entity | Creature | Elemental | Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Bloodwater Entity enters the battlefield, you may put target instant or sorcery card from your graveyard on top of your library. | Viktor Titov
River Hoopoe | Creature | Bird | Flying
{3}{G}{U}: You gain 2 life and draw a card. | Ryan Pancoast
Obelisk Spider | Creature | Spider | Reach
Whenever Obelisk Spider deals combat damage to a creature, put a -1/-1 counter on that creature.
Whenever you put one or more -1/-1 counters on a creature, each opponent loses 1 life and you gain 1 life. | YW Tang