Rock Hydra enters with X +1/+1 counters on it.For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.: Put a +1/+1 counter on Rock Hydra. Activate only during your upkeep.
Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)Other Zombies have ": Regenerate this permanent."
As Black Vise enters, choose an opponent.At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.
Flying (This creature can't be blocked except by creatures with flying or reach.)Nightmare's power and toughness are each equal to the number of Swamps you control.
Enchant creature card in a graveyardWhen Animate Dead enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with Animate Dead." Return enchanted creature card to the battlefield under your control and attach Animate Dead to it. When Animate Dead leaves the battlefield, that...
