Isochron Scepter [The List] Kiora Wood Elemental's power and toughness

Wood Elemental's power and toughness are each equal to the number of Forests sacrificed as it entered the battlefield

Set: Magic 2014 Type: Enchantment Rarity: Rare Cost: {B}{B}{B} Whenever a creature you control dies

and we can use that to our advantage

Set: Beta Edition Type: Artifact Rarity: Rare Cost: {4} Nevinyrral's Disk enters the battlefield tapped

Isochron Scepter [The List] Kiora Wood Elemental's power and toughnessSet: The List Type: Artifact Rarity: Uncommon Cost: {2} Imprint When Isochron Scepter enters the battlefield, you may exile an instant card with mana value 2 or less from your hand. {2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.