Terastodon [Double Masters] Elf Knight it will reduce to nothing

it will reduce to nothing

Set: Tempest Type: Creature — Serpent Rarity: Rare Cost: {5}{U}{U}{U} Islandwalk (This creature can't be blocked as long as defending player controls an Island

Set: Onslaught Type: Creature — Human Cleric Rarity: Uncommon Cost: {2}{B} {B}

Set: Mystery Booster Type: Creature — Human Soldier Rarity: Common Cost: {2}{R} First strike (This creature deals combat damage before creatures without first strike

Terastodon [Double Masters] Elf Knight it will reduce to nothingSet: Double Masters Type: Creature Elephant Rarity: Rare Cost: {6}{G}{G} When Terastodon enters the battlefield, you may destroy up to three target noncreature permanents. For each permanent put into a graveyard this way, its controller creates a 3 3 green Elephant creature token.