Deathgreeter

Whenever another creature dies, you may gain 1 life.

Grim Guardian

Constellation — Whenever Grim Guardian or another enchantment you control enters, each opponent loses 1 life.

Whenever a creature an opponent controls enters, you may have that player lose 1 life.

At the beginning of your upkeep, you may gain 1 life.

Whenever you gain life, each opponent loses 1 life.

At the beginning of your end step, each opponent loses 1 life and you gain 1 life.

Target opponent loses 3 life.
Flashback {5}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

When you cast this spell, any player may pay 5 life. If a player does, counter Dash Hopes.
Counter target spell.