For example, Aven Mindcensor limits how much your opponents can search their library, while Thalia, Heretic Cathar turns all their lands into tap lands
Lighting boots on fire (hot foot!)
Mikaeus, the Unhallowed [Highest Combo Potential With Undying Synergy] Mikaeus, the Unhallowed enables explosive turns by giving undying to all non-Humans , turning Zombies into repeatable threats and combo pieces
There's no other card that gives you two mana for one with no downside, and this ultra-consistent ramp card can go in any EDH deck, making it an auto-include for most people who aren't making a conscious effort to be hipster
and Ratigan's Party for a burst of value with minimal risk
That means two copies of powerful mana rocks like Gilded Lotus, which in turn leads to two Portal to Phyrexia, Cybermen Squadron, and anything else you can think of