You may use abilities that play as fast effects multiple times before sacrificing the permanent, such as Knight of Dusk's " Your Hand - A Precious Resource Of the three cards you draw at one time, only the top card is revealed, and that card is considered your hand
And whenever you cast an Eldrazi spell, you can pay two colorless mana to copy all spells and abilities you have on the stack
Emrakul, the Aeons Torn is the obvious answer, but you can probably look at Sundering Titan, Progenitus, or a host of other finishers depending on the matchup
Norman Osborn / Green Goblin Norman Osborn is a 2-drop that is capable of repeated connives every turn because it is unblockable
The Assassin and/or commander doesn't even have to be alive or under your control
7: You get an emblem with Whenever a creature you control enters, it deals damage equal to its power to any target. Illustrated by Kieran Yanner Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp