Sliver Overlord (139) - Scourge Aether Revolt Prerelease Promos The book shrieks horribly until

The book shrieks horribly until its cover is opened

Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target

" —Cabal Patriarch

A delicate veil of glamers can prove as sturdy as iron

"Folks 'round here are too in love with their contraptions

Sliver Overlord (139) - Scourge Aether Revolt Prerelease Promos The book shrieks horribly untilSet: 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, put it into your hand, then shuffle. {3}: Gain control of target Sliver. (This effect lasts indefinitely.) The end of evolution.