Greven, Predator Captain [Commander 2019] Phyrexian Goblin The River Heralds found clues

The River Heralds found clues to a grand heritage below Ixalan's surface

Set: The List Type: Creature — Sliver Rarity: Common Cost: {1}{G} All Sliver creatures get +1/+1

Set: Murders at Karlov Manor Commander Type: Creature — Human Warrior Rarity: Rare Cost: {3}{R} Whenever one or more creatures attack one of your opponents or a planeswalker they control

Now it's your team's turn to ask the questions

Greven, Predator Captain [Commander 2019] Phyrexian Goblin The River Heralds found cluesSet: Commander 2019 Type: Legendary Creature Phyrexian Human Warrior Rarity: Mythic Cost: {3}{B}{R} Menace Greven, Predator Captain gets +X +0, where X is the amount of life you've lost this turn. Whenever Greven attacks, you may sacrifice another creature. If you do, you draw cards equal to that creature's power and you lose life equal to that creature's toughness.