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: Betrayers of Kamigawa Type: Instant — Arcane Rarity: Rare Cost: {X}{U}{U} You may exile a blue card with converted mana cost X from your hand rather than pay this spell's mana cost

then discard three cards

Set: XY: Evolutions Type: Colorless Rarity: Ultra Rare Retreat cost: 0

Set: Platinum: Base Set Type: Grass Rarity: Ultra 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.