Enchant land

Whenever enchanted land is tapped for mana, its controller adds an additional {G}.

Flying (This creature can’t be blocked except by creatures with flying or reach.)

{B}: Regenerate Will-o’-the-Wisp. (The next time this creature would be destroyed this turn, it isn’t. Instead tap it, remove all damage from it, and remove it from combat.)

As long as Winter Orb is untapped, players can’t untap more than one land during their untap steps.

Whenever a player casts a green spell, you may pay {1}. If you do, you gain 1 life.

Destroy all creatures. They can’t be regenerated.

Other Zombie creatures have swampwalk. (They can’t be blocked as long as defending player controls a Swamp.)

Other Zombies have “{B}: Regenerate this permanent.”