Sliver Overlord [Scourge] Darkness [-30] you can't be attacked except

you can't be attacked except by creatures with flying and/or islandwalk

Set: XY: Steam Siege Type: Metal Rarity: Ultra Rare Retreat cost: Colorless

Set: Zendikar Expeditions Type: Land Rarity: Mythic {T}: Add {C}

To become king of the Goblins

Set: XY: Phantom Forces Type: Psychic Rarity: Secret Rare Retreat cost: Colorless

Sliver Overlord [Scourge] Darkness [-30] you can't be attacked exceptSet: Scourge Type: Legendary Creature Sliver Mutant Rarity: Rare Cost: {W}{U}{B}{R}{G} {3}: Search your library for a Sliver card, reveal that card, and put it into your hand. Then shuffle your library. {3}: Gain control of target Sliver. (This effect lasts indefinitely.) The end of evolution.