Angel of Despair

Flying
When Angel of Despair enters, destroy target permanent.

Cathodion

Sacrifice Fume Spitter: Put a -1/-1 counter on target creature.

Flying
When this creature enters or dies, mill two cards. (Put the top two cards of your library into your graveyard.)

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

Heroic — Whenever you cast a spell that targets Arena Athlete, target creature an opponent controls can't block this turn.