Kozilek's Return [Oath of the Gatewatch Prerelease Promos] Beast Creatures with swampwalk can be

Creatures with swampwalk can be blocked as though they didn't have swampwalk

That player discards that card

Whenever enchanted creature deals combat damage to a player

Set: Amonkhet Invocations Type: Sorcery Rarity: Mythic Cost: {1}{B} As an additional cost to cast this spell

you lose 20 life

Kozilek's Return [Oath of the Gatewatch Prerelease Promos] Beast Creatures with swampwalk can beSet: Oath of the Gatewatch Prerelease Promos Type: Instant Rarity: Mythic Cost: {2}{R} Devoid (This card has no color.) Kozilek's Return deals 2 damage to each creature. Whenever you cast an Eldrazi creature spell with mana value 7 or greater, you may exile Kozilek's Return from your graveyard. If you do, Kozilek's Return deals 5 damage to each creature.