Lake of the Dead [Alliances] Planechase Anthology put a -1/-1 counter on

put a -1/-1 counter on each creature your opponents control

Set: Ixalan Type: Enchantment Rarity: Rare Cost: {4}{B} Whenever a creature an opponent controls dies

Most myr monitor other species

Set: Tenth Edition Type: Enchantment Rarity: Rare Cost: {1}{B}{B}{B} Whenever a creature you control dies

Lake of the Dead [Alliances] Planechase Anthology put a -1/-1 counter onSet: Alliances Type: Land Rarity: Rare If Lake of the Dead would enter the battlefield, sacrifice a Swamp instead. If you do, put Lake of the Dead onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add {B}. {T}, Sacrifice a Swamp: Add {B}{B}{B}{B}.