Ob Nixilis asks you if youd like to turn your seven-drop creature into a Griselbrand trigger
The main idea would be to return cards to the top of the opponent's deck with, for example, a Memory Lapse and then use some spell that allows you to exile the top card
Empyrial Storm 4WW Sorcery When you cast this spell, copy it for each time you've cast your commander from the command zone this game
The reason for this is that it's the time where you have the least vulnerability
In the right go-wide deck, such as Elves or Goblins, you can easily get boosts in the +4/+4 to +5+5 range going, too, which are very hard to deal with
This Banshee used to be pretty heavily played at the kitchen table with its 2/2 flying body that gives a dork -2/-2 until the end of the turn which can kill loads of things like Flametongue Kavu and Eternal Witness and Birds of Paradise and Esper Sentinel