Centaur Garden

{T}: Add {G}. This land deals 1 damage to you.
Threshold — {G}, {T}, Sacrifice this land: Target creature gets +3/+3 until end of turn. Activate only if seven or more cards are in your graveyard.

World Championship Decks 2003

Odyssey

oc
T: Add o
G to your mana pool. Centaur Garden deals 1 damage to you.
Threshold o
G, oc
T, Sacrifice Centaur Garden: Target creature gets +3/+3 until end of turn. (Play this ability only if seven or more cards are in your graveyard.)