Wall of Wood [Alpha Edition] Spirit but it is true that

but it is true that these artifacts can be dangerous

Set: Happy Holidays Type: Enchantment Rarity: Mythic Cost: {2}{U}{U} At the beginning of your upkeep

Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card

Set: Visions Type: Artifact Rarity: Rare Cost: {4} At the beginning of each player's draw step

Set: Eldritch Moon Prerelease Promos Type: Creature — Eldrazi Boar Rarity: Mythic Cost: {10} Emerge {6}{G}{G}{G} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value

Wall of Wood [Alpha Edition] Spirit but it is true thatSet: Alpha Edition Type: Creature Wall Rarity: Common Cost: {G} Defender (This creature can't attack.) Everybody knows that to ward off trouble, you knock on wood. But usually it's better to make a wall out of the wood and let trouble do the knocking.