Sliver Overlord [Scourge] 65 then sacrifice it unless you

then sacrifice it unless you pay its upkeep cost for each age counter on it

Set: Limited Edition Beta Type: Artifact Rarity: Rare Cost: {0} {T}: Add {B}

Set: Base Set 1st Edition Type: Colorless Rarity: Common

1 Trostani's Summoner

Set: XY: BREAKpoint Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Sliver Overlord [Scourge] 65 then sacrifice it unless youSet: 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.