Flash.Whenever Evelyn, the Covetous or another Vampire enters the battlefield under your control, exile the top card of each players library with a collection counter on it.Once each turn, you may play a card from exile with a collection counter on it if it was exiled by an ability you controlled, and you may spend mana as though it were any color to cast it
Thrumming Hivepool is a rare artifact card that looks really powerful for any Sliver deck, but is technically not an actual sliver
Singer of Swift RiversSinger of Swift Rivers I love this Merfolk Shaman because it's such a richly Simic card

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its just way better than it needs to be for seemingly no reason
Witness Protection A simple nullify effect that deals with indestructible creatures for just 1 mana is a great deal for any commander player