All creatures have wither. Whenever chaos ensues, put a -1/-1 counter on target creature, two -1/-1 counters on another target creature, and three -1/-1 counters on a third target creature.
Raven's Run Dragoon can't be blocked by black creatures.
"I have a gift. The ability to sense encroaching darkness has saved many lives. And yet constantly feeling the force of so much ugliness is a terrible burden."
When Ravenloft Adventurer enters the battlefield, you take the initiative. If a creature an opponent controls would die, instead exile it and put a hit counter on it. Whenever Ravenloft Adventurer attacks, if you've completed a dungeon, defending player loses 1 life for each card they own in exile with a hit counter on it.
Discard a card: Ravenous Bloodseeker gets +2/-2 until end of turn.
"Nothing will cool the fire in their blood. They are too far gone. We must keep them away from our towns at any cost." —Cosper Lowe of the Silbern Guard
When Ravenous Gigamole enters the battlefield, mill three cards. You may put a creature card from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on Ravenous Gigamole.
Devour 3 When Ravenous Gigantotherium enters the battlefield, it deals X damage divided as you choose among up to X target creatures, where X is its power. Each of those creatures deals damage equal to its power to Ravenous Gigantotherium.
Sacrifice an artifact: Ravenous Intruder gets +2/+2 until end of turn.
"I've made some fine acquisitions of late, so I'm planning to make commensurate improvements to my security systems. I have a consultant coming tomorrow." —Kurna Majan, Luminary League
Target creature you control deals damage equal to its power to target creature you don't control. Choose a creature card in your hand. It perpetually gets +X/+X, where X is the amount of excess damage dealt this way.
When Ravenous Rotbelly enters the battlefield, you may sacrifice up to three Zombies. When you sacrifice one or more Zombies this way, each opponent sacrifices that many creatures.
The patrol found the graf empty save for a few well-chewed bones.
When Ravenous Sailback enters the battlefield, choose one — • Ravenous Sailback gains haste until end of turn. • Destroy target artifact or enchantment.
Converter beasts were sent to ensnare as many of Ixalan's dinosaurs as possible. Many of them were converted themselves—into snacks.
Ravenous Slime can't be blocked by creatures with power 2 or less. If a creature an opponent controls would die, instead exile it and put a number of +1/+1 counters equal to that creature's power on Ravenous Slime.